Send takeover msg from MT to CC using the animation path.

third_party/WebKit/Source/platform/scroll/ScrollAnimatorTest.cpp

Index: third_party/WebKit/Source/platform/scroll/ScrollAnimatorTest.cpp
diff --git a/third_party/WebKit/Source/platform/scroll/ScrollAnimatorTest.cpp b/third_party/WebKit/Source/platform/scroll/ScrollAnimatorTest.cpp
index 60cbd81283394626de3ce6814cdfbb45b4814a1d..5fc75b0812fb03fc6f3071319bde330b8bb560b9 100644
--- a/third_party/WebKit/Source/platform/scroll/ScrollAnimatorTest.cpp
+++ b/third_party/WebKit/Source/platform/scroll/ScrollAnimatorTest.cpp
@@ -519,21 +519,23 @@ TEST(ScrollAnimatorTest, CancellingCompositorAnimation)
     ThreadHeap::collectAllGarbage();
 }
 
-// This test verifies that ImplOnlyAnimationUpdate gets cleared once its
-// pushed to compositor animation host.
+// This test verifies that impl only animation updates get cleared once they
+// are pushed to compositor animation host.
 TEST(ScrollAnimatorTest, ImplOnlyAnimationUpdatesCleared)
 {
     MockScrollableArea* scrollableArea = MockScrollableArea::create(true);
     TestScrollAnimator* animator = new TestScrollAnimator(scrollableArea, getMockedTime);
 
-    EXPECT_CALL(*scrollableArea, registerForAnimation()).Times(2);
+    // From calls to adjust/takeoverImplOnlyScrollOffsetAnimation.
+    EXPECT_CALL(*scrollableArea, registerForAnimation()).Times(3);
 
+    // Verify that the adjustment update is cleared.
     EXPECT_EQ(animator->m_runState, ScrollAnimatorCompositorCoordinator::RunState::Idle);
     EXPECT_FALSE(animator->hasAnimationThatRequiresService());
     EXPECT_TRUE(animator->implOnlyAnimationAdjustmentForTesting().isZero());
 
-    animator->updateImplOnlyScrollOffsetAnimation(FloatSize(100.f, 100.f));
-    animator->updateImplOnlyScrollOffsetAnimation(FloatSize(10.f, -10.f));
+    animator->adjustImplOnlyScrollOffsetAnimation(FloatSize(100.f, 100.f));
+    animator->adjustImplOnlyScrollOffsetAnimation(FloatSize(10.f, -10.f));
 
     EXPECT_TRUE(animator->hasAnimationThatRequiresService());
     EXPECT_EQ(FloatSize(110.f, 90.f), animator->implOnlyAnimationAdjustmentForTesting());
@@ -544,6 +546,12 @@ TEST(ScrollAnimatorTest, ImplOnlyAnimationUpdatesCleared)
     EXPECT_FALSE(animator->hasAnimationThatRequiresService());
     EXPECT_TRUE(animator->implOnlyAnimationAdjustmentForTesting().isZero());
 
+    // Verify that the takeover update is cleared.
+    animator->takeoverImplOnlyScrollOffsetAnimation();
+    EXPECT_TRUE(animator->hasAnimationThatRequiresService());
+    animator->updateCompositorAnimations();
+    EXPECT_FALSE(animator->hasAnimationThatRequiresService());
+
     // Forced GC in order to finalize objects depending on the mock object.
     ThreadHeap::collectAllGarbage();
 }