cc: Rasterize cheap tiles immediately

cc/tile_manager.h

Index: cc/tile_manager.h
diff --git a/cc/tile_manager.h b/cc/tile_manager.h
index 16212ed66e5f7398d0bbbaf572f245ace0824ace..568b4d66335858e99e22505130f18a1179660ecf 100644
--- a/cc/tile_manager.h
+++ b/cc/tile_manager.h
@@ -11,6 +11,7 @@
 
 #include "base/hash_tables.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/time.h"
 #include "base/values.h"
 #include "cc/memory_history.h"
 #include "cc/rendering_stats.h"
@@ -95,7 +96,8 @@ class CC_EXPORT TileManager {
   TileManager(TileManagerClient* client,
               ResourceProvider *resource_provider,
               size_t num_raster_threads,
-              bool record_rendering_stats);
+              bool record_rendering_stats,
+              bool use_cheapess_estimator);
   virtual ~TileManager();
 
   const GlobalStateThatImpactsTilePriority& GlobalState() const {
@@ -105,6 +107,7 @@ class CC_EXPORT TileManager {
 
   void ManageTiles();
   void CheckForCompletedTileUploads();
+  void ResetCheapRasterBudget();
 
   scoped_ptr<base::Value> AsValue() const;
   void GetMemoryStats(size_t* memoryRequiredBytes,
@@ -144,8 +147,15 @@ class CC_EXPORT TileManager {
       scoped_refptr<Tile> tile, skia::LazyPixelRef* pixel_ref);
   void OnImageDecodeTaskCompleted(
       scoped_refptr<Tile> tile, uint32_t pixel_ref_id);
-  bool CanDispatchRasterTask(Tile* tile);
+  bool CanDispatchRasterTask(Tile* tile) const;
+  bool CanPerformCheapRaster(Tile* tile) const;
+  scoped_ptr<ResourcePool::Resource> PrepareTileForRaster(Tile* tile);
   void DispatchOneRasterTask(scoped_refptr<Tile> tile);
+  void PerformOneRaster(Tile* tile);
+  void OnRasterCompleted(
+      scoped_refptr<Tile> tile,
+      scoped_ptr<ResourcePool::Resource> resource,
+      int manage_tiles_call_count_when_dispatched);
   void OnRasterTaskCompleted(
       scoped_refptr<Tile> tile,
       scoped_ptr<ResourcePool::Resource> resource,
@@ -157,7 +167,7 @@ class CC_EXPORT TileManager {
                         WhichTree tree);
   scoped_ptr<Value> GetMemoryRequirementsAsValue() const;
 
-  static void RunRasterTask(uint8* buffer,
+  static void PerformRaster(uint8* buffer,
                             const gfx::Rect& rect,
                             float contents_scale,
                             PicturePileImpl* picture_pile,
@@ -194,6 +204,10 @@ class CC_EXPORT TileManager {
   bool record_rendering_stats_;
   RenderingStats rendering_stats_;
 
+  bool use_cheapness_estimator_;
+  int cheap_raster_count_;
+  base::TimeDelta cheap_raster_time_;
+
   int raster_state_count_[NUM_STATES][NUM_TREES][NUM_BINS];
 
   DISALLOW_COPY_AND_ASSIGN(TileManager);