Re-land: cc: Examine layers to determine if we're ready to activate.

cc/trees/layer_tree_host_impl.h

 // Copyright 2011 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 CC_TREES_LAYER_TREE_HOST_IMPL_H_
 #define CC_TREES_LAYER_TREE_HOST_IMPL_H_
 
 #include <list>
 #include <set>
 #include <string>
@@ skipping 214 matching lines @@
   // excludes the URL bar and non-overlay scrollbars and is in DIP (and
   // invariant relative to page scale).
   gfx::SizeF UnscaledScrollableViewportSize() const;
   float VerticalAdjust() const;
 
   // RendererClient implementation.
   virtual void SetFullRootLayerDamage() OVERRIDE;
 
   // TileManagerClient implementation.
   virtual void NotifyReadyToActivate() OVERRIDE;
-  virtual void NotifyTileInitialized(const Tile* tile) OVERRIDE;
+  virtual void NotifyTileStateChanged(const Tile* tile) OVERRIDE;
 
   // ScrollbarAnimationControllerClient implementation.
   virtual void PostDelayedScrollbarFade(const base::Closure& start_fade,
                                         base::TimeDelta delay) OVERRIDE;
   virtual void SetNeedsScrollbarAnimationFrame() OVERRIDE;
 
   // OutputSurfaceClient implementation.
   virtual void DeferredInitialize() OVERRIDE;
   virtual void ReleaseGL() OVERRIDE;
   virtual void CommitVSyncParameters(base::TimeTicks timebase,
@@ skipping 435 matching lines @@
   std::set<SwapPromiseMonitor*> swap_promise_monitor_;
 
   size_t transfer_buffer_memory_limit_;
 
   DISALLOW_COPY_AND_ASSIGN(LayerTreeHostImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_HOST_IMPL_H_