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* Split default and user-supplied event tracers.Gravatar mtklein2015-04-21
| | | | | | | | | | | Chrome's got a test scenario where setting the user-supplied tracer is racing with a concurrent use of the default tracer. BUG=chromium:437044 No public API changes. TBR=reed@google.com Review URL: https://codereview.chromium.org/1099123002
* Revert of Revert of remove unused (by clients) SkPathUtils (patchset #1 id:1 ↵Gravatar reed2015-04-16
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | of https://codereview.chromium.org/1060703003/) Reason for revert: fix (removal from gypi/gn files) has landed in chrome. Original issue's description: > Revert of remove unused (by clients) SkPathUtils (patchset #1 id:1 of https://codereview.chromium.org/1088383003/) > > Reason for revert: > This change is causing the DEPS roll to fail: > > > http://build.chromium.org/p/tryserver.chromium.linux/builders/android_chromium_gn_compile_rel/builds/78771/steps/gn/logs/stdio > > Original issue's description: > > remove unused (by clients) SkPathUtils > > > > BUG=skia: > > > > Committed: https://skia.googlesource.com/skia/+/aab35d91b8b80acd1902594bbf542083fdfa4bb7 > > TBR=scroggo@google.com,reed@chromium.org > NOPRESUBMIT=true > NOTREECHECKS=true > NOTRY=true > BUG=skia: > > Committed: https://skia.googlesource.com/skia/+/bdb0bf5f8858043878d8a4fa8130c6c87bef3fd4 TBR=scroggo@google.com,jcgregorio@google.com NOPRESUBMIT=true NOTREECHECKS=true NOTRY=true BUG=skia: Review URL: https://codereview.chromium.org/1091963002
* Revert of remove unused (by clients) SkPathUtils (patchset #1 id:1 of ↵Gravatar jcgregorio2015-04-16
| | | | | | | | | | | | | | | | | | | | | | | | https://codereview.chromium.org/1088383003/) Reason for revert: This change is causing the DEPS roll to fail: http://build.chromium.org/p/tryserver.chromium.linux/builders/android_chromium_gn_compile_rel/builds/78771/steps/gn/logs/stdio Original issue's description: > remove unused (by clients) SkPathUtils > > BUG=skia: > > Committed: https://skia.googlesource.com/skia/+/aab35d91b8b80acd1902594bbf542083fdfa4bb7 TBR=scroggo@google.com,reed@chromium.org NOPRESUBMIT=true NOTREECHECKS=true NOTRY=true BUG=skia: Review URL: https://codereview.chromium.org/1060703003
* remove unused (by clients) SkPathUtilsGravatar reed2015-04-16
| | | | | | BUG=skia: Review URL: https://codereview.chromium.org/1088383003
* Add a paint filter utility canvas (SkPaintFilterCanvas)Gravatar fmalita2015-03-26
| | | | | | | | | | Introduce a paint filter proxy base class as a SkDrawFilter replacement, and convert SkDebugCanvas to use the new approach. BUG=skia:3587 R=reed@google.com,mtklein@google.com,robertphillips@google.com,tomhudson@google.com Review URL: https://codereview.chromium.org/1032173002
* C++11 override should now be supported by all of {bots,Chrome,Android,Mozilla}Gravatar mtklein2015-03-25
| | | | | | | | | NOPRESUBMIT=true BUG=skia: DOCS_PREVIEW= https://skia.org/?cl=1037793002 Review URL: https://codereview.chromium.org/1037793002
* [Skia] Add SK_API to SkParse.Gravatar huangs2015-03-02
| | | | | | | | | | For https://codereview.chromium.org/924063003/ , we would like to use the SkParse::FindColor(). Adding SK_API to SkParse is necessary for component build to work. BUG=skia: Review URL: https://codereview.chromium.org/971623003
* Avoid wrong memory access due to double substitution and %%Gravatar kkinnunen2015-02-19
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Use the form SkDebugf("%s", arbitraryString) instead of SkDebugf(arbitraryString). Fixes the case where SkString::appendf-ing a string with "%%" and then printing the string with SkDebugf would cause uninitialized read and corrupted debug print. ninja -C out/Debug tools && valgrind --leak-check=full ./out/Debug/render_pictures --config gpu -w q -r ... ... ==7307== Conditional jump or move depends on uninitialised value(s) ==7307== at 0x6908475: __printf_fp (printf_fp.c:1180) ==7307== by 0x6904267: vfprintf (vfprintf.c:1629) ==7307== by 0x6906E53: buffered_vfprintf (vfprintf.c:2313) ==7307== by 0x690188D: vfprintf (vfprintf.c:1316) ==7307== by 0x67E8F5: SkDebugf(char const*, ...) (SkDebug_stdio.cpp:18) ==7307== by 0x7983F1: GrContext::printCacheStats() const (GrTest.cpp:54) ==7307== by 0x408ECF: tool_main(int, char**) (render_pictures_main.cpp:480) ==7307== by 0x40913E: main (render_pictures_main.cpp:511) ==7307== Budget: 2048 items 100663296 bytes Entry Count: current 652 (651 budgeted, 0 wrapped, 297 locked, 638 scratch 32 0.000000ull), high 652 Entry Bytes: current 51087658 (budgeted 49826658, 49 0.000000ull, 1261000 unbudgeted) high 51087658 (observe "ull" instead of "% full") (from mtklein) This CL is not editing public API. TBR=reed@google.com Review URL: https://codereview.chromium.org/943453002
* Remove SkProxyCanvas.Gravatar scroggo2015-01-29
| | | | | | | | | | | | | | SkProxyCanvas is redundant with SkNWayCanvas, and means another class we have to keep in sync with the SkCanvas interface. Remove tests which use an SkProxyCanvas. Requires a change to chromium. BUG=skia:3279 BUG=skia:500 Review URL: https://codereview.chromium.org/886813002
* remove (unused) GatherPixelRefsGravatar reed2015-01-22
| | | | | | BUG=skia: Review URL: https://codereview.chromium.org/869463002
* Fix SkIStream nits.Gravatar bungeman2015-01-22
| | | | | | | | | Fix comment, constness of one field, and delete already checks for NULL. TBR=reed@google.com Trivial change to debatably public api. Review URL: https://codereview.chromium.org/868643003
* Remove staging SkStream::unref().Gravatar bungeman2015-01-22
| | | | | | | | | SkStream::unref() was added to ease transitioning off of SkStream deriving from SkRefCnt. It is no longer needed, remove it. TBR=reed@google.com Review URL: https://codereview.chromium.org/861413002
* Make SkStream *not* ref counted.Gravatar scroggo2015-01-21
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | SkStream is a stateful object, so it does not make sense for it to have multiple owners. Make SkStream inherit directly from SkNoncopyable. Update methods which previously called SkStream::ref() (e.g. SkImageDecoder::buildTileIndex() and SkFrontBufferedStream::Create(), which required the existing owners to call SkStream::unref()) to take ownership of their SkStream parameters and delete when done (including on failure). Switch all SkAutoTUnref<SkStream>s to SkAutoTDelete<SkStream>s. In some cases this means heap allocating streams that were previously stack allocated. Respect ownership rules of SkTypeface::CreateFromStream() and SkImageDecoder::buildTileIndex(). Update the comments for exceptional methods which do not affect the ownership of their SkStream parameters (e.g. SkPicture::CreateFromStream() and SkTypeface::Deserialize()) to be explicit about ownership. Remove test_stream_life, which tested that buildTileIndex() behaved correctly when SkStream was a ref counted object. The test does not make sense now that it is not. In SkPDFStream, remove the SkMemoryStream member. Instead of using it, create a new SkMemoryStream to pass to fDataStream (which is now an SkAutoTDelete). Make other pdf rasterizers behave like SkPDFDocumentToBitmap. SkPDFDocumentToBitmap delete the SkStream, so do the same in the following pdf rasterizers: SkPopplerRasterizePDF SkNativeRasterizePDF SkNoRasterizePDF Requires a change to Android, which currently treats SkStreams as ref counted objects. Review URL: https://codereview.chromium.org/849103004
* upstream google3 include paths for jsoncppGravatar mtklein2015-01-14
| | | | | | | | | BUG=skia: No public API changes TBR=reed@google.com Review URL: https://codereview.chromium.org/853613002
* Fix up all the easy virtual ... SK_OVERRIDE cases.Gravatar mtklein2015-01-09
| | | | | | | | | | | | This fixes every case where virtual and SK_OVERRIDE were on the same line, which should be the bulk of cases. We'll have to manually clean up the rest over time unless I level up in regexes. for f in (find . -type f); perl -p -i -e 's/virtual (.*)SK_OVERRIDE/\1SK_OVERRIDE/g' $f; end BUG=skia: Review URL: https://codereview.chromium.org/806653007
* Revert of Revert of move remaining virtual draw methods to onDraw (patchset ↵Gravatar reed2015-01-05
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | #1 id:1 of https://codereview.chromium.org/835913002/) Reason for revert: test to see if it wasn't this CL that broke chromeos Original issue's description: > Revert of move remaining virtual draw methods to onDraw (patchset #5 id:80001 of https://codereview.chromium.org/817723005/) > > Reason for revert: > did this cause chromeos heap corruption on skp? > > Original issue's description: > > move remaining virtual draw methods to onDraw > > > > BUG=skia: > > > > Committed: https://skia.googlesource.com/skia/+/2e0f7d53bba5438c9bf11ee5ccae2c301e348419 > > TBR=robertphillips@google.com,djsollen@google.com,bsalomon@google.com,mtklein@google.com > NOTREECHECKS=true > NOTRY=true > BUG=skia: > > Committed: https://skia.googlesource.com/skia/+/e87e383351e1547b21d96d02bcd0c3cbbe0837f1 TBR=robertphillips@google.com,djsollen@google.com,bsalomon@google.com,mtklein@google.com,reed@chromium.org NOTREECHECKS=true NOTRY=true BUG=skia: Review URL: https://codereview.chromium.org/831253002
* Revert of move remaining virtual draw methods to onDraw (patchset #5 ↵Gravatar reed2015-01-05
| | | | | | | | | | | | | | | | | | | | | id:80001 of https://codereview.chromium.org/817723005/) Reason for revert: did this cause chromeos heap corruption on skp? Original issue's description: > move remaining virtual draw methods to onDraw > > BUG=skia: > > Committed: https://skia.googlesource.com/skia/+/2e0f7d53bba5438c9bf11ee5ccae2c301e348419 TBR=robertphillips@google.com,djsollen@google.com,bsalomon@google.com,mtklein@google.com NOTREECHECKS=true NOTRY=true BUG=skia: Review URL: https://codereview.chromium.org/835913002
* move remaining virtual draw methods to onDrawGravatar reed2015-01-04
| | | | | | BUG=skia: Review URL: https://codereview.chromium.org/817723005
* remove unused drawDataGravatar reed2015-01-02
| | | | | | BUG=skia: Review URL: https://codereview.chromium.org/830083002
* There can be only one (SkRandom)!Gravatar scroggo2014-12-15
| | | | | | | | | | | | | | | | | | | | | Remove SkLCGRandom. We already decided the new one was better, which is why we wrote the new SkRandom. Convert GMs that were using SkLCGRandom to use the improved SkRandom. Motivated by the fact that these GMs draw differently on some runs. We believe this to be a result of using the old SkLCGRandom. Add each of the tests that were using SkLCGRandom to ignore-tests.txt, since we expect they'll draw differently using SkRandom. Move a trimmed down version of SkLCGRandom into SkDiscretePathEffect. In order to preserve the old behavior, trim down SkLCGRandom to only the methods used by SkDiscretePathEffect, and hide it in SkDiscretePathEffect's cpp file. BUG=skia:3241 Review URL: https://codereview.chromium.org/805963002
* Remove SkCanvas::isDrawingToLayerGravatar junov2014-12-15
| | | | | | BUG=3245 Review URL: https://codereview.chromium.org/803913005
* Cleanup: Mark some overridden methods with 'SK_OVERRIDE'.Gravatar tfarina2014-12-14
| | | | | | | | | | | | | | This fixes errors like this: ../../include/gpu/effects/GrPorterDuffXferProcessor.h:27:25: error: 'name' overrides a member function but is not marked 'override' [-Werror,-Winconsistent-missing-override] BUG=skia:3075 TEST=ninja -C out/Debug skia_lib TBR=bsalomon@google.com Review URL: https://codereview.chromium.org/804813002
* Cull pushCull and popCull from Skia.Gravatar mtklein2014-12-12
| | | | | | | | These calls are unused and going away. Waiting on crrev.com/796083002. BUG=skia: Review URL: https://codereview.chromium.org/794263002
* Remove SkCanvas::drawBitmapMatrix()Gravatar Florin Malita2014-12-10
| | | | | | R=mtklein@google.com, reed@google.com, robertphillips@google.com Review URL: https://codereview.chromium.org/789033002
* Change clear() to respect the clipGravatar reed2014-12-04
| | | | | | | | | This reverts commit af641a1c10f176cb9617026d3cc93c117a85d13d. BUG=skia: TBR= Review URL: https://codereview.chromium.org/783493002
* Revert "Change clear() to respect the clip"Gravatar reed2014-12-02
| | | | | | | | | This reverts commit 3729469d6a12266037b697c2192768545e097ab0. BUG=skia: TBR= Review URL: https://codereview.chromium.org/778563002
* Change clear() to respect the clipGravatar reed2014-12-02
| | | | | | | | patch from issue 769703002 at patchset 1 (http://crrev.com/769703002#ps1) BUG=skia: Review URL: https://codereview.chromium.org/772533004
* Implement SkPicture::bytesUsed() for SkRecord backendGravatar tomhudson2014-11-19
| | | | | | | BUG=chromium:230419 R=mtklein@google.com,reed@google.com Review URL: https://codereview.chromium.org/490253003
* http://skbug.com/3130 step 4 (include/utils/SkWGL.h gone for good)Gravatar halcanary2014-11-18
| | | | | | BUG=skia:3130 Review URL: https://codereview.chromium.org/729363003
* Fix Chromium roll broken by http://crrev.com/728823002Gravatar halcanary2014-11-14
| | | | Review URL: https://codereview.chromium.org/727783004
* Enable unused param checking for public includes.Gravatar djsollen2014-11-14
| | | | | | | | | | This CL cleans up the existing violations and enables the build time check to ensure that we don't regress. The motiviation behind this change is to allow clients who include our headers to be able to build with this warning enabled. Review URL: https://codereview.chromium.org/726923002
* Move WGL header from include to srcGravatar djsollen2014-11-14
| | | | | | NOTRY=true Review URL: https://codereview.chromium.org/728823002
* Revert of Override SkCanvas::drawImage() in SkDeferredCanvas and SkGPipe ↵Gravatar piotaixr2014-11-04
| | | | | | | | | | | | | | | | | | | | | | (patchset #8 id:140001 of https://codereview.chromium.org/613673005/) Reason for revert: The patch is breaking the telemetry blink build on some windows configurations Original issue's description: > Override SkCanvas::drawImage() in SkDeferredCanvas and SkGPipe > > Depend on https://codereview.chromium.org/663233002 > > BUG=skia:2947 > > Committed: https://skia.googlesource.com/skia/+/687732fe046c9cfec940f2d7f661cd97651d10a8 > > Committed: https://skia.googlesource.com/skia/+/9bb7539a59ab15749fe26fecfec05330cffae684 BUG=skia:2947, 426708 Review URL: https://codereview.chromium.org/705633002
* add textblobs to luaGravatar reed2014-11-03
| | | | | | | BUG=skia: TBR= Review URL: https://codereview.chromium.org/688363003
* move SkTextBox into utilsGravatar reed2014-11-03
| | | | | | | BUG=skia: TBR= Review URL: https://codereview.chromium.org/696293005
* Override SkCanvas::drawImage[Rect]() in SkProxyCanvasGravatar piotaixr2014-10-28
| | | | | | BUG=skia:2947 Review URL: https://codereview.chromium.org/679293002
* Add isScale() helper function to SkMatrix44.Gravatar tfarina2014-10-24
| | | | | | | | | | This will be used later in Chromium to cleanup gfx::Transform::IsScale2d(). BUG=408710,skia:997 TEST=None R=bsalomon@google.com,danakj@chromium.org Review URL: https://codereview.chromium.org/676583002
* Override SkCanvas::drawImage() in SkDeferredCanvas and SkGPipeGravatar piotaixr2014-10-22
| | | | | | | | | | Depend on https://codereview.chromium.org/663233002 BUG=skia:2947 Committed: https://skia.googlesource.com/skia/+/687732fe046c9cfec940f2d7f661cd97651d10a8 Review URL: https://codereview.chromium.org/613673005
* add round/ceil/etc. for SkMScalarGravatar reed2014-10-21
| | | | | | | BUG=skia: TBR= Review URL: https://codereview.chromium.org/645793006
* Revert of Override SkCanvas::drawImage() in SkDeferredCanvas and SkGPipe ↵Gravatar rmistry2014-10-17
| | | | | | | | | | | | | | | | | | | | | | | | | | (patchset #5 id:80001 of https://codereview.chromium.org/613673005/) Reason for revert: Trying to fix DEPS roll failure: https://codereview.chromium.org/660113002/ Link to failing builds: http://build.chromium.org/p/tryserver.blink/builders/linux_blink_rel/builds/29578 http://build.chromium.org/p/tryserver.blink/builders/linux_blink_dbg/builds/29354 Original issue's description: > Override SkCanvas::drawImage() in SkDeferredCanvas and SkGPipe > > BUG=skia:2947 > > Committed: https://skia.googlesource.com/skia/+/687732fe046c9cfec940f2d7f661cd97651d10a8 TBR=junov@chromium.org,reed@google.com,bsalomon@chromium.org,piotaixr@chromium.org NOTREECHECKS=true NOTRY=true BUG=skia:2947 Review URL: https://codereview.chromium.org/658293004
* Override SkCanvas::drawImage() in SkDeferredCanvas and SkGPipeGravatar piotaixr2014-10-16
| | | | | | BUG=skia:2947 Review URL: https://codereview.chromium.org/613673005
* Turn SkCanvasStateUtils into a class with static functions.Gravatar tfarina2014-10-10
| | | | | | | | | | That simplifies the way to declare it a friend, as needed in SkCanvas. BUG=skia:2914 TEST=make most R=reed@google.com Review URL: https://codereview.chromium.org/645773002
* Override drawImage*() in SkNWayCanvasGravatar piotaixr2014-09-29
| | | | | | | | | BUG=skia:2947 R=junov@chromium.org, reed@google.com, bsalomon@chromium.org Author: piotaixr@chromium.org Review URL: https://codereview.chromium.org/600643002
* SkMatrix44::preserves2dAxisAlignment()Gravatar tomhudson2014-09-26
| | | | | | | | | | | | Convenience function requested for Chrome compositor that may have a performance advantage. BUG=skia:1017 R=reed@google.com, danakj@chromium.org, vollick@chromium.org Author: tomhudson@google.com Review URL: https://codereview.chromium.org/508303005
* Introduce Props to surface (patchset #27 id:520001 of ↵Gravatar reed2014-09-22
| | | | | | | | | | | | https://codereview.chromium.org/551463004/)" This reverts commit 29c857d0f3a1cb837f73406eeb6ba9771879b5e7. TBR= Author: reed@google.com Review URL: https://codereview.chromium.org/588143004
* Revert of introduce Props to surface (patchset #27 id:520001 of ↵Gravatar reed2014-09-21
| | | | | | | | | | | | | | | | | | | | | | | | https://codereview.chromium.org/551463004/) Reason for revert: Broke call site in WebKit Original issue's description: > introduce Props to surface (work in progress) > > BUG=skia: > > Committed: https://skia.googlesource.com/skia/+/3716fd067a5621bb94a6cb08d72afec8bf3aceda R=robertphillips@google.com, bsalomon@google.com, jvanverth@google.com, bungeman@google.com, fmalita@google.com, vangelis@chromium.org, reed@google.com TBR=bsalomon@google.com, bungeman@google.com, fmalita@google.com, jvanverth@google.com, reed@google.com, robertphillips@google.com, vangelis@chromium.org NOTREECHECKS=true NOTRY=true BUG=skia: Author: reed@chromium.org Review URL: https://codereview.chromium.org/583773004
* introduce Props to surface (work in progress)Gravatar reed2014-09-21
| | | | | | | | | BUG=skia: R=robertphillips@google.com, bsalomon@google.com, jvanverth@google.com, bungeman@google.com, fmalita@google.com, vangelis@chromium.org, reed@chromium.org Author: reed@google.com Review URL: https://codereview.chromium.org/551463004
* Add helper SkMatrix44::hasPerspective()Gravatar tomhudson2014-09-16
| | | | | | | | | BUG=skia:1017 R=danakj@chromium.org, reed@google.com Author: tomhudson@google.com Review URL: https://codereview.chromium.org/513343002
* Picture Recording: fix the performance bottleneck in ↵Gravatar yunchao.he2014-09-15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | SkDeferredCanvas::isFullFrame blink skips all pending commands during picture recording if it is drawing an opaque full-frame geometry or image. This may improve performance for some edge cases. To recognize an opaque full-frame drawing should be cheap enough. Otherwise, the overhead will offset the improvement. Unfortunately, data from perf for content_shell on Nexus7 shows that SkDeferredCanvas::isFullFrame is far from cheap. Table below shows that how much isFullFrame() costs in the whole render process. benchmark percentage my local benchmark(draw 1000 sprites) 4.1% speedReading 2.8% FishIETank(1000 fishes) 1.5% GUIMark3 Bitmap 2.0% By contrast, real recording (SkGPipeCanvas::drawBitmapRectToRect) and real rasterization (GrDrawTarget::drawRect) cost ~4% and ~6% in the whole render process respectively. Apparently, SkDeferredCanvas::isFullFrame() is nontrivial. getDeviceSize() is the main contributor to this hotspot. The change simply save the canvasSize and reuse it among drawings if it is not a fresh frame. This change cut off ~65% (or improved ~2 times) of isFullFrame(). telemetry smoothness canvas_tough_test didn't show obvious improvement or regression. BUG=411166 Committed: https://skia.googlesource.com/skia/+/8e45c3777d886ba3fe239bb549d06b0693692152 R=junov@chromium.org, tomhudson@google.com, reed@google.com Author: yunchao.he@intel.com Review URL: https://codereview.chromium.org/545813002
* Revert of Picture Recording: fix the performance bottleneck in ↵Gravatar mtklein2014-09-15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | SkDeferredCanvas::isFullFrame (patchset #7 id:140001 of https://codereview.chromium.org/545813002/) Reason for revert: This is leaking memory: http://108.170.220.120:10117/builders/Test-Ubuntu13.10-GCE-NoGPU-x86_64-Debug-ASAN/builds/2516/steps/RunDM/logs/stdio Original issue's description: > Picture Recording: fix the performance bottleneck in SkDeferredCanvas::isFullFrame > > blink skips all pending commands during picture recording if it is drawing an opaque full-frame > geometry or image. This may improve performance for some edge cases. To recognize an opaque > full-frame drawing should be cheap enough. Otherwise, the overhead will offset the improvement. > Unfortunately, data from perf for content_shell on Nexus7 shows that SkDeferredCanvas::isFullFrame > is far from cheap. Table below shows that how much isFullFrame() costs in the whole render process. > > benchmark percentage > my local benchmark(draw 1000 sprites) 4.1% > speedReading 2.8% > FishIETank(1000 fishes) 1.5% > GUIMark3 Bitmap 2.0% > > By contrast, real recording (SkGPipeCanvas::drawBitmapRectToRect) and real rasterization > (GrDrawTarget::drawRect) cost ~4% and ~6% in the whole render process respectively. Apparently, > SkDeferredCanvas::isFullFrame() is nontrivial. > > getDeviceSize() is the main contributor to this hotspot. The change simply save the canvasSize and > reuse it among drawings if it is not a fresh frame. This change cut off ~65% (or improved ~2 times) > of isFullFrame(). > > telemetry smoothness canvas_tough_test didn't show obvious improvement or regression. > > BUG=411166 > > Committed: https://skia.googlesource.com/skia/+/8e45c3777d886ba3fe239bb549d06b0693692152 R=junov@chromium.org, tomhudson@google.com, reed@google.com, yunchao.he@intel.com TBR=junov@chromium.org, reed@google.com, tomhudson@google.com, yunchao.he@intel.com NOTREECHECKS=true NOTRY=true BUG=411166 Author: mtklein@google.com Review URL: https://codereview.chromium.org/571053002