Blink Compositor Animation: Introduce CompositorAnimationHost correctly.

third_party/WebKit/Source/core/frame/FrameView.cpp

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999 Lars Knoll <knoll@kde.org>
  *                     1999 Antti Koivisto <koivisto@kde.org>
  *                     2000 Dirk Mueller <mueller@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  *           (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
@@ skipping 539 matching lines @@
 
 LayoutViewItem FrameView::layoutViewItem() const {
   return LayoutViewItem(frame().contentLayoutObject());
 }
 
 ScrollingCoordinator* FrameView::scrollingCoordinator() const {
   Page* p = page();
   return p ? p->scrollingCoordinator() : 0;
 }
 
+CompositorAnimationHost* FrameView::compositorAnimationHost() const {
+  ScrollingCoordinator* c = scrollingCoordinator();
+  return c ? c->compositorAnimationHost() : nullptr;
+}
+
 CompositorAnimationTimeline* FrameView::compositorAnimationTimeline() const {
   ScrollingCoordinator* c = scrollingCoordinator();
   return c ? c->compositorAnimationTimeline() : nullptr;
 }
 
 LayoutBox* FrameView::layoutBox() const {
   return layoutView();
 }
 
 FloatQuad FrameView::localToVisibleContentQuad(
@@ skipping 4123 matching lines @@
   DCHECK(m_frame->isMainFrame());
   return m_initialViewportSize.width();
 }
 
 int FrameView::initialViewportHeight() const {
   DCHECK(m_frame->isMainFrame());
   return m_initialViewportSize.height();
 }
 
 }  // namespace blink