Delay activation/draw on GPU tile work completion

cc/tiles/picture_layer_tiling.h

Index: cc/tiles/picture_layer_tiling.h
diff --git a/cc/tiles/picture_layer_tiling.h b/cc/tiles/picture_layer_tiling.h
index 99e30d9f054c796c3a07999223931cfc26780c0a..99820e9882c98f9abeb3910e85f0364567a8bf2e 100644
--- a/cc/tiles/picture_layer_tiling.h
+++ b/cc/tiles/picture_layer_tiling.h
@@ -248,6 +248,8 @@ class CC_EXPORT PictureLayerTiling {
   void AsValueInto(base::trace_event::TracedValue* array) const;
   size_t GPUMemoryUsageInBytes() const;
 
+  void UpdateRequiredStatesOnTile(Tile* tile) const;
+
  protected:
   friend class CoverageIterator;
   friend class PrioritizedTile;
@@ -290,7 +292,6 @@ class CC_EXPORT PictureLayerTiling {
   Tile::CreateInfo CreateInfoForTile(int i, int j) const;
   bool ShouldCreateTileAt(const Tile::CreateInfo& info) const;
   bool IsTileOccluded(const Tile* tile) const;
-  void UpdateRequiredStatesOnTile(Tile* tile) const;
   PrioritizedTile MakePrioritizedTile(
       Tile* tile,
       PriorityRectType priority_rect_type) const;