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

third_party/WebKit/Source/platform/animation/CompositorAnimationHost.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CompositorAnimationHost_h
 #define CompositorAnimationHost_h
 
 #include "base/memory/ref_counted.h"
 #include "cc/animation/animation_host.h"
 #include "platform/PlatformExport.h"
@@ skipping 14 matching lines @@
 // TODO(ymalik): Correctly introduce CompositorAnimationHost to blink. See
 // crbug.com/610763.
 class PLATFORM_EXPORT CompositorAnimationHost {
 public:
     explicit CompositorAnimationHost(cc::AnimationHost*);
 
     // TODO(ymalik): Remove when CompositorAnimationHost* optional nullable ptr
     // is returned. See crbug.com/610763.
     bool isNull() const;
 
-    void updateImplOnlyScrollOffsetAnimation(const gfx::Vector2dF& adjustment, cc::ElementId);
+    void adjustImplOnlyScrollOffsetAnimation(cc::ElementId, const gfx::Vector2dF& adjustment);
+    void takeOverImplOnlyScrollOffsetAnimation(cc::ElementId);
 
 private:
     cc::AnimationHost* m_animationHost;
 };
 
 } // namespace blink
 
 #endif // CompositorAnimationTimeline_h