cc: Fix memory limit edge cases for SetIsLikelyToRequireADraw.

cc/resources/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_RESOURCES_TILE_MANAGER_H_
 #define CC_RESOURCES_TILE_MANAGER_H_
 
 #include <deque>
 #include <queue>
 #include <set>
@@ skipping 138 matching lines @@
       Tile* tile = tiles[i];
       FreeResourcesForTile(tile);
     }
   }
 
   void SetGlobalStateForTesting(
       const GlobalStateThatImpactsTilePriority& state) {
     global_state_ = state;
   }
 
+  TileTaskRunner* TileTaskRunnerForTesting() const { return tile_task_runner_; }
+
   void SetTileTaskRunnerForTesting(TileTaskRunner* tile_task_runner);
 
   void FreeResourcesAndCleanUpReleasedTilesForTesting() {
     FreeResourcesForReleasedTiles();
     CleanUpReleasedTiles();
   }
 
   std::vector<Tile*> AllTilesForTesting() const {
     std::vector<Tile*> tiles;
     for (TileMap::const_iterator it = tiles_.begin(); it != tiles_.end();
          ++it) {
       tiles.push_back(it->second);
     }
     return tiles;
   }
 
   void SetScheduledRasterTaskLimitForTesting(size_t limit) {
     scheduled_raster_task_limit_ = limit;
   }
 
+  void CheckIfMoreTilesNeedToBePreparedForTesting();
+
   bool IsReadyToActivate() const;

[vmpstr, 2015/03/27 17:23:28]

While here, can you move these to be above the for-testing functions and group
all of the for testing functions near the end of public:. Also can you add a
comment along the lines of "the rest of the public interface here is used for
testing." Also, maybe we should change our tests to have a FakeTileManager that
promotes protected functions to public, just so this becomes cleaner (this is
unrelated to your patch).

[sunnyps, 2015/03/27 18:38:04]

Done.

   bool IsReadyToDraw() const;
 
  protected:
   TileManager(TileManagerClient* client,
               const scoped_refptr<base::SequencedTaskRunner>& task_runner,
               ResourcePool* resource_pool,
               TileTaskRunner* tile_task_runner,
               Rasterizer* rasterizer,
               size_t scheduled_raster_task_limit);
 
@@ skipping 121 matching lines @@
 
   bool did_notify_ready_to_activate_;
   bool did_notify_ready_to_draw_;
 
   DISALLOW_COPY_AND_ASSIGN(TileManager);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_TILE_MANAGER_H_