Improve scroll anchoring's interactions with the visual viewport

third_party/WebKit/Source/platform/scroll/ScrollAnimatorCompositorCoordinator.h

Index: third_party/WebKit/Source/platform/scroll/ScrollAnimatorCompositorCoordinator.h
diff --git a/third_party/WebKit/Source/platform/scroll/ScrollAnimatorCompositorCoordinator.h b/third_party/WebKit/Source/platform/scroll/ScrollAnimatorCompositorCoordinator.h
index a7a83e7ac139a7eafc3d1ee727d90a48a7c310e1..d893baf89fa51bc5427e92eda5d0f41a02d8a089 100644
--- a/third_party/WebKit/Source/platform/scroll/ScrollAnimatorCompositorCoordinator.h
+++ b/third_party/WebKit/Source/platform/scroll/ScrollAnimatorCompositorCoordinator.h
@@ -46,7 +46,7 @@ public:
     virtual void takeOverCompositorAnimation();
     // Updates the scroll position of the animator's ScrollableArea by
     // adjustment and update the target of an ongoing scroll offset animation.
-    virtual void adjustAnimationAndSetScrollPosition(IntSize adjustment, ScrollType);
+    virtual void adjustAnimationAndSetScrollPosition(const DoublePoint& position, ScrollType);
     virtual void updateCompositorAnimations();
 
     virtual ScrollableArea* getScrollableArea() const = 0;
@@ -60,6 +60,8 @@ public:
 protected:
     explicit ScrollAnimatorCompositorCoordinator();
 
+    void scrollPositionChanged(const DoublePoint& offset, ScrollType);
+
     void adjustImplOnlyScrollOffsetAnimation(const IntSize& adjustment);
     IntSize implOnlyAnimationAdjustmentForTesting() { return m_implOnlyAnimationAdjustment; }