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

cc/trees/layer_tree_host_impl.h

Index: cc/trees/layer_tree_host_impl.h
diff --git a/cc/trees/layer_tree_host_impl.h b/cc/trees/layer_tree_host_impl.h
index 55ccab68a6b0cdc647602a703bbbc8923a820300..93712d40bc53edc096e80c6e223a918cf0a98bbc 100644
--- a/cc/trees/layer_tree_host_impl.h
+++ b/cc/trees/layer_tree_host_impl.h
@@ -271,7 +271,7 @@ class CC_EXPORT LayerTreeHostImpl
   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.
@@ -413,6 +413,8 @@ class CC_EXPORT LayerTreeHostImpl
 
   ResourceProvider::ResourceId ResourceIdForUIResource(UIResourceId uid) const;
 
+  void DidInitializeVisibleTile();
+
  protected:
   LayerTreeHostImpl(
       const LayerTreeSettings& settings,
@@ -483,7 +485,7 @@ class CC_EXPORT LayerTreeHostImpl
                               bool zero_budget);
   void EnforceManagedMemoryPolicy(const ManagedMemoryPolicy& policy);
 
-  void DidInitializeVisibleTile();
+
 
   typedef base::hash_map<UIResourceId, ResourceProvider::ResourceId>
       UIResourceMap;