cc: Change required_for_activation bookkeeping.

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 202 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;
 
   // OutputSurfaceClient implementation.
   virtual void DeferredInitialize() OVERRIDE;
   virtual void ReleaseGL() OVERRIDE;
   virtual void SetNeedsRedrawRect(const gfx::Rect& rect) OVERRIDE;
   virtual void BeginFrame(const BeginFrameArgs& args) OVERRIDE;
   virtual void SetExternalDrawConstraints(
       const gfx::Transform& transform,
       const gfx::Rect& viewport,
       const gfx::Rect& clip,
@@ skipping 416 matching lines @@
   int id_;
 
   std::set<SwapPromiseMonitor*> swap_promise_monitor_;
 
   DISALLOW_COPY_AND_ASSIGN(LayerTreeHostImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_HOST_IMPL_H_