Animations: Introduce compositor AnimationPlayer and AnimationTimeline.

Source/web/WebFrameWidgetImpl.cpp

 /*
  * Copyright (C) 2014 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 1007 matching lines @@
             m_layerTreeView->registerViewportLayers(nullptr, pageScaleLayer, rootScrollLayer->platformLayer(), nullptr);
         } else {
             m_layerTreeView->clearRootLayer();
             m_layerTreeView->clearViewportLayers();
         }
     }
 
     suppressInvalidations(false);
 }
 
+void WebFrameWidgetImpl::attachCompositorAnimationTimeline(WebCompositorAnimationTimeline* compositorTimeline)
+{
+    if (m_layerTreeView)
+        m_layerTreeView->attachCompositorAnimationTimeline(compositorTimeline);
+
+}
+
+void WebFrameWidgetImpl::detachCompositorAnimationTimeline(WebCompositorAnimationTimeline* compositorTimeline)
+{
+    if (m_layerTreeView)
+        m_layerTreeView->detachCompositorAnimationTimeline(compositorTimeline);
+}
+
 void WebFrameWidgetImpl::setVisibilityState(WebPageVisibilityState visibilityState, bool isInitialState)
 {
     if (!m_page)
         return;
 
     // FIXME: This is not correct, since Show and Hide messages for a frame's Widget do not necessarily
     // correspond to Page visibility, but is necessary until we properly sort out OOPIF visibility.
     m_page->setVisibilityState(static_cast<PageVisibilityState>(visibilityState), isInitialState);
 
     if (m_layerTreeView) {
         bool visible = visibilityState == WebPageVisibilityStateVisible;
         m_layerTreeView->setVisible(visible);
     }
 }
 
 } // namespace blink