Defer starting of animations until after compositing update

Source/core/animation/AnimationClockTest.cpp

 /*
  * Copyright (c) 2013, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 30 matching lines @@
 class AnimationAnimationClockTest : public ::testing::Test {
 protected:
     virtual void SetUp()
     {
         animationClock = AnimationClock::create(mockTimeFunction);
         mockTime = 200;
     }
 
     static double mockTimeFunction()
     {
-        return mockTime++;
+        return mockTime;
     }
 
     static double mockTime;
     OwnPtr<AnimationClock> animationClock;
 };
 
 double AnimationAnimationClockTest::mockTime;
 
 TEST_F(AnimationAnimationClockTest, CurrentTime)
 {
+    // Current time should not advance until minTimeBeforeUnsynchronizedTick has elapsed
     EXPECT_EQ(200, animationClock->currentTime());
+    mockTime = 200 + 0.0025;
     EXPECT_EQ(200, animationClock->currentTime());
-    animationClock->unfreeze();
-    EXPECT_EQ(201, animationClock->currentTime());
-    EXPECT_EQ(201, animationClock->currentTime());
+
+    mockTime = 200 + 0.005;
+    EXPECT_EQ(mockTime, animationClock->currentTime());
 }
 
 TEST_F(AnimationAnimationClockTest, UpdateTime)
 {
     animationClock->updateTime(100);
     EXPECT_EQ(100, animationClock->currentTime());
+    mockTime = 200;
     EXPECT_EQ(100, animationClock->currentTime());
-    animationClock->updateTime(150);
-    EXPECT_EQ(150, animationClock->currentTime());
-    EXPECT_EQ(150, animationClock->currentTime());
+
+    animationClock->unfreeze();
+    EXPECT_EQ(200, animationClock->currentTime());
+
+    animationClock->updateTime(300);
+    EXPECT_EQ(300, animationClock->currentTime());
+    mockTime = 400;
+    EXPECT_EQ(300, animationClock->currentTime());
 }
 
 }