Change SkTime::GetMSecs to double; ensure values stored in SkMSec do not overflow.

The following are currently unused in Android, Google3, Chromium, and Mozilla:
  - SkEvent
  - SkTime::GetMSecs
  - SK_TIME_FACTOR (also unused in Skia)
  - SkAutoTime

I left uses of SkMSec more-or-less intact for SkEvent, SkAnimator, and SkInterpolator. SkInterpolator is used in Chromium, so I did not want to change the API. The views/ and animator/ code is crufty, so it didn't seem worthwhile to refactor it. Instead, I added SkEvent::GetMSecsSinceStartup, which is likely to be adequate for use in SampleApp.

I also left SkMSec where it is used to measure a duration rather than a timestamp. With the exception of SkMovie, which is used in Android, all of the uses appear to measure the execution time of a piece of code, which I would hope does not exceed 2^31 milliseconds.

Added skiatest::Timer to support a common idiom in tests where we want to measure the wallclock time in integer milliseconds. (Not used in tests/PathOpsSkpClipTest.cpp because it redefines things in Test.h.)

Removed tabs in tests/StrokerTest.cpp.

BUG=skia:4632
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1811613004

Review URL: https://codereview.chromium.org/1811613004

1 files changed, 14 insertions, 0 deletions

diff --git a/tests/Test.cpp b/tests/Test.cpp
index f6f2bdab3d..dcb08e6bad 100644
--- a/tests/Test.cpp
+++ b/tests/Test.cpp
@@ -36,3 +36,17 @@ SkString skiatest::GetTmpDir() {
     const char* tmpDir = FLAGS_tmpDir.isEmpty() ? nullptr : FLAGS_tmpDir[0];
     return SkString(tmpDir);
 }
+
+skiatest::Timer::Timer() : fStartNanos(SkTime::GetNSecs()) {}
+
+double skiatest::Timer::elapsedNs() const {
+    return SkTime::GetNSecs() - fStartNanos;
+}
+
+double skiatest::Timer::elapsedMs() const { return this->elapsedNs() * 1e-6; }
+
+SkMSec skiatest::Timer::elapsedMsInt() const {
+    const double elapsedMs = this->elapsedMs();
+    SkASSERT(SK_MSecMax >= elapsedMs);
+    return static_cast<SkMSec>(elapsedMs);
+}