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

2 files changed, 10 insertions, 3 deletions

diff --git a/include/views/SkEvent.h b/include/views/SkEvent.h
index 0af76fe686..b8fc00ef51 100644
--- a/include/views/SkEvent.h
+++ b/include/views/SkEvent.h
@@ -206,13 +206,20 @@ public:
     /**
      *  Post to the event queue using the event's targetID or target-proc.
      *  The event will be delivered no sooner than the specified millisecond
-     *  time, as measured by SkTime::GetMSecs().
+     *  time, as measured by GetMSecsSinceStartup().
      *
      *  The event must be dynamically allocated, as ownership is transferred to
      *  the event queue. It cannot be allocated on the stack or in a global.
      */
     void postTime(SkMSec time);
 
+    /**
+     *  Returns ~zero the first time it's called, then returns the number of
+     *  milliseconds since the first call. Behavior is undefined if the program
+     *  runs more than ~25 days.
+     */
+    static SkMSec GetMSecsSinceStartup();
+
     ///////////////////////////////////////////////
     /** Porting layer must call these functions **/
     ///////////////////////////////////////////////
diff --git a/include/views/SkTouchGesture.h b/include/views/SkTouchGesture.h
index 4a03065e25..60487c7a2f 100644
--- a/include/views/SkTouchGesture.h
+++ b/include/views/SkTouchGesture.h
@@ -55,14 +55,14 @@ private:
         float   fStartX, fStartY;
         float   fPrevX, fPrevY;
         float   fLastX, fLastY;
-        SkMSec  fPrevT, fLastT;
+        float   fPrevT, fLastT;
     };
     SkTDArray<Rec> fTouches;
 
     State           fState;
     SkMatrix        fLocalM, fGlobalM;
     SkFlingState    fFlinger;
-    SkMSec          fLastUpT;
+    double          fLastUpMillis;
     SkPoint         fLastUpP;