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 110 matching lines @@
   void UpdateVisibleTiles(const GlobalStateThatImpactsTilePriority& state);
 
   scoped_refptr<Tile> CreateTile(RasterSource* raster_source,
                                  const gfx::Size& desired_texture_size,
                                  const gfx::Rect& content_rect,
                                  float contents_scale,
                                  int layer_id,
                                  int source_frame_number,
                                  int flags);
 
+  bool IsReadyToActivate() const;
+  bool IsReadyToDraw() const;
+
   scoped_refptr<base::trace_event::ConvertableToTraceFormat> BasicStateAsValue()
       const;
   void BasicStateAsValueInto(base::trace_event::TracedValue* dict) const;
   const MemoryHistory::Entry& memory_stats_from_last_assign() const {
     return memory_stats_from_last_assign_;
   }
 
+  // Public methods for testing.
   void InitializeTilesWithResourcesForTesting(const std::vector<Tile*>& tiles) {
     for (size_t i = 0; i < tiles.size(); ++i) {
       TileDrawInfo& draw_info = tiles[i]->draw_info();
       draw_info.resource_ = resource_pool_->AcquireResource(
           tiles[i]->desired_texture_size(),
           tile_task_runner_->GetResourceFormat());
     }
   }
 
   void ReleaseTileResourcesForTesting(const std::vector<Tile*>& tiles) {
@@ skipping 21 matching lines @@
          ++it) {
       tiles.push_back(it->second);
     }
     return tiles;
   }
 
   void SetScheduledRasterTaskLimitForTesting(size_t limit) {
     scheduled_raster_task_limit_ = limit;
   }
 
-  bool IsReadyToActivate() const;
-  bool IsReadyToDraw() const;
+  void CheckIfMoreTilesNeedToBePreparedForTesting() {
+    CheckIfMoreTilesNeedToBePrepared();
+  }
 
  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);
 
   void FreeResourcesForReleasedTiles();
@@ skipping 120 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_