CC: Fix missing swap-used-incomplete-tile updates

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 <string>
 #include <vector>
@@ skipping 253 matching lines @@
   void SetNeedsManageTiles() { manage_tiles_needed_ = true; }
 
   void Readback(void* pixels, gfx::Rect rect_in_device_viewport);
 
   LayerTreeImpl* active_tree() { return active_tree_.get(); }
   const LayerTreeImpl* active_tree() const { return active_tree_.get(); }
   LayerTreeImpl* pending_tree() { return pending_tree_.get(); }
   const LayerTreeImpl* pending_tree() const { return pending_tree_.get(); }
   const LayerTreeImpl* recycle_tree() const { return recycle_tree_.get(); }
   virtual void CreatePendingTree();
-  void UpdateVisibleTiles();
+  virtual void UpdateVisibleTiles();
   virtual void ActivatePendingTree();
 
   // Shortcuts to layers on the active tree.
   LayerImpl* RootLayer() const;
   LayerImpl* RootScrollLayer() const;
   LayerImpl* CurrentlyScrollingLayer() const;
 
   virtual void SetVisible(bool visible);
   bool visible() const { return visible_; }
 
@@ skipping 121 matching lines @@
   bool page_scale_animation_active() const { return !!page_scale_animation_; }
 
   void CreateUIResource(UIResourceId uid,
                         scoped_refptr<UIResourceBitmap> bitmap);
   // Deletes a UI resource.  May safely be called more than once.
   void DeleteUIResource(UIResourceId uid);
   void DeleteAllUIResources();
 
   ResourceProvider::ResourceId ResourceIdForUIResource(UIResourceId uid) const;
 
+  void DidInitializeVisibleTileForTesting() { DidInitializeVisibleTile(); }
+
  protected:
   LayerTreeHostImpl(
       const LayerTreeSettings& settings,
       LayerTreeHostImplClient* client,
       Proxy* proxy,
       RenderingStatsInstrumentation* rendering_stats_instrumentation);
 
   // Virtual for testing.
   virtual void AnimateLayers(base::TimeTicks monotonic_time,
                              base::Time wall_clock_time);
@@ skipping 175 matching lines @@
 
   // Optional callback to notify of new tree activations.
   base::Closure tree_activation_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(LayerTreeHostImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_HOST_IMPL_H_