Add cheapness predictor success histogram

cc/tile_manager.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_TILE_MANAGER_H_
 #define CC_TILE_MANAGER_H_
 
 #include <list>
 #include <queue>
 #include <vector>
@@ skipping 147 matching lines @@
   void DidFinishTileInitialization(Tile* tile);
   void DidTileRasterStateChange(Tile* tile, TileRasterState state);
   void DidTileBinChange(Tile* tile,
                         TileManagerBin bin,
                         WhichTree tree);
   scoped_ptr<Value> GetMemoryRequirementsAsValue() const;
 
   static void RunRasterTask(uint8* buffer,
                             const gfx::Rect& rect,
                             float contents_scale,
+                            bool use_cheapness_estimator,
                             PicturePileImpl* picture_pile,
                             RenderingStats* stats);
   static void RunImageDecodeTask(skia::LazyPixelRef* pixel_ref,
                                  RenderingStats* stats);
 
+  static void RecordCheapnessPredictorCorrectness(

[nduca, 2013/02/05 00:22:26]

indentation, follow chrome style guide

foo(bar,
    baz)

or
  foo(
      bar, baz)

In this case, probably the frist

+    bool is_predicted_cheap,
+    bool is_actually_cheap
+  );
+
   TileManagerClient* client_;
   scoped_ptr<ResourcePool> resource_pool_;
   scoped_ptr<RasterWorkerPool> raster_worker_pool_;
   bool manage_tiles_pending_;
   int manage_tiles_call_count_;
 
   GlobalStateThatImpactsTilePriority global_state_;
 
   typedef std::vector<Tile*> TileVector;
   TileVector tiles_;
@@ skipping 19 matching lines @@
   bool use_cheapness_estimator_;
 
   int raster_state_count_[NUM_STATES][NUM_TREES][NUM_BINS];
 
   DISALLOW_COPY_AND_ASSIGN(TileManager);
 };
 
 }  // namespace cc
 
 #endif  // CC_TILE_MANAGER_H_