cc: Make LayerAnimationController keep state for clearing scroll delta

cc/test/animation_test_common.h

Index: cc/test/animation_test_common.h
diff --git a/cc/test/animation_test_common.h b/cc/test/animation_test_common.h
index 57d2e9701b2b2541f6282e37e3100e5a9b3edf1d..b2909b8711fcf82da8238fc12bafed87bd00874f 100644
--- a/cc/test/animation_test_common.h
+++ b/cc/test/animation_test_common.h
@@ -82,7 +82,6 @@ class FakeLayerAnimationValueObserver : public LayerAnimationValueObserver {
   void OnTransformAnimated(const gfx::Transform& transform) override;
   void OnScrollOffsetAnimated(const gfx::ScrollOffset& scroll_offset) override;
   void OnAnimationWaitingForDeletion() override;
-  void OnScrollOffsetAnimationRemoved() override;
   bool IsActive() const override;
 
   const FilterOperations& filters() const { return filters_; }
@@ -94,20 +93,12 @@ class FakeLayerAnimationValueObserver : public LayerAnimationValueObserver {
     return animation_waiting_for_deletion_;
   }
 
-  bool scroll_offset_animation_removed() const {
-    return scroll_offset_animation_removed_;
-  }
-  void reset_scroll_offset_animation_removed() {
-    scroll_offset_animation_removed_ = false;
-  }
-
  private:
   FilterOperations filters_;
   float opacity_;
   gfx::Transform transform_;
   gfx::ScrollOffset scroll_offset_;
   bool animation_waiting_for_deletion_;
-  bool scroll_offset_animation_removed_;
 };
 
 class FakeInactiveLayerAnimationValueObserver