cc: ReadyToDraw notifications.

cc/layers/picture_layer_impl.h

 // Copyright 2012 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_LAYERS_PICTURE_LAYER_IMPL_H_
 #define CC_LAYERS_PICTURE_LAYER_IMPL_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 131 matching lines @@
   size_t GPUMemoryUsageInBytes() const override;
 
   void RunMicroBenchmark(MicroBenchmarkImpl* benchmark) override;
 
   // Functions used by tile manager.
   PictureLayerImpl* GetPendingOrActiveTwinLayer() const;
   bool IsOnActiveOrPendingTree() const;
   // Virtual for testing.
   virtual bool HasValidTilePriorities() const;
   bool AllTilesRequiredForActivationAreReadyToDraw() const;
+  bool AllTilesRequiredForDrawAreReadyToDraw() const;
 
  protected:
   friend class LayerRasterTileIterator;
 
   PictureLayerImpl(LayerTreeImpl* tree_impl, int id);
   PictureLayerTiling* AddTiling(float contents_scale);
   void RemoveTiling(float contents_scale);
   void RemoveAllTilings();
   void SyncFromActiveLayer(const PictureLayerImpl* other);
   void AddTilingsForRasterScale();
@@ skipping 11 matching lines @@
 
   void DoPostCommitInitializationIfNeeded() {
     if (needs_post_commit_initialization_)
       DoPostCommitInitialization();
   }
   void DoPostCommitInitialization();
 
   bool CanHaveTilings() const;
   bool CanHaveTilingWithScale(float contents_scale) const;
   void SanityCheckTilingState() const;
+  // Checks if all tiles required for a certain action (e.g. activation) are
+  // ready to draw.  is_tile_required_callback gets called on all candidate
+  // tiles and returns true if the tile is required for the action.
+  template <typename F>
+  bool AllTilesRequiredAreReadyToDraw(const F& is_tile_required_callback) const;
 
   bool ShouldAdjustRasterScaleDuringScaleAnimations() const;
 
   void GetDebugBorderProperties(SkColor* color, float* width) const override;
   void GetAllTilesForTracing(std::set<const Tile*>* tiles) const override;
   void AsValueInto(base::debug::TracedValue* dict) const override;
 
   virtual void UpdateIdealScales();
   float MaximumTilingContentsScale() const;
 
@@ skipping 30 matching lines @@
   // frame that has a valid viewport for prioritizing tiles.
   gfx::Rect visible_rect_for_tile_priority_;
 
   friend class PictureLayer;
   DISALLOW_COPY_AND_ASSIGN(PictureLayerImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_PICTURE_LAYER_IMPL_H_