cc: Remove invalidated recycle tree tiles on activation.

cc/resources/picture_layer_tiling.h

Index: cc/resources/picture_layer_tiling.h
diff --git a/cc/resources/picture_layer_tiling.h b/cc/resources/picture_layer_tiling.h
index 457632c63aadb091d369ceb4b95e5a17573b3215..952c7af6d7a4277d547b222f963c52539858ded4 100644
--- a/cc/resources/picture_layer_tiling.h
+++ b/cc/resources/picture_layer_tiling.h
@@ -130,6 +130,7 @@ class CC_EXPORT PictureLayerTiling {
   void UpdateTilesToCurrentPile(const Region& layer_invalidation,
                                 const gfx::Size& new_layer_bounds);
   void CreateMissingTilesInLiveTilesRect();
+  void RemoveTilesInRegion(const Region& layer_region);
 
   void SetClient(PictureLayerTilingClient* client);
   void set_resolution(TileResolution resolution) { resolution_ = resolution; }
@@ -283,6 +284,9 @@ class CC_EXPORT PictureLayerTiling {
   void UpdateEvictionCacheIfNeeded(TreePriority tree_priority);
   void Invalidate(const Region& layer_region);
 
+  void DoInvalidate(const Region& layer_region,
+                    bool recreate_invalidated_tiles);
+
   // Given properties.
   float contents_scale_;
   gfx::Size layer_bounds_;