Communicate MT changes to impl-only scroll offset animations

third_party/WebKit/Source/platform/animation/CompositorAnimationTimeline.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 CompositorAnimationTimeline_h
 #define CompositorAnimationTimeline_h
 
 #include "base/memory/ref_counted.h"
 #include "cc/animation/animation_timeline.h"
 #include "platform/PlatformExport.h"
 #include "wtf/Noncopyable.h"
 
 #include <memory>
 
 namespace blink {
 
+class CompositorAnimationHost;
 class CompositorAnimationPlayerClient;
 
-// A compositor representation for timeline.
+// A compositor representation for cc::AnimationTimeline.
 class PLATFORM_EXPORT CompositorAnimationTimeline {
     WTF_MAKE_NONCOPYABLE(CompositorAnimationTimeline);
 public:
     CompositorAnimationTimeline();
     virtual ~CompositorAnimationTimeline();
 
     cc::AnimationTimeline* animationTimeline() const;
+    // TODO(ymalik): Currently we just wrap cc::AnimationHost in
+    // CompositorAnimationHost. Correctly introduce CompositorAnimationHost
+    // to blink. See crbug.com/610763.
+    CompositorAnimationHost compositorAnimationHost();
 
     virtual void playerAttached(const CompositorAnimationPlayerClient&);
     virtual void playerDestroyed(const CompositorAnimationPlayerClient&);
 
 private:
     scoped_refptr<cc::AnimationTimeline> m_animationTimeline;
 };
 
 } // namespace blink
 
 #endif // CompositorAnimationTimeline_h