cc: Don't activate rasterize on demand when we have 0 memory.

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 145 matching lines @@
   }
 
   void SetRasterizerForTesting(Rasterizer* rasterizer);
 
   void FreeResourcesAndCleanUpReleasedTilesForTesting() {
     prioritized_tiles_.Clear();
     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;
+  }
+
  protected:
   TileManager(TileManagerClient* client,
               const scoped_refptr<base::SequencedTaskRunner>& task_runner,
               ResourcePool* resource_pool,
               Rasterizer* rasterizer,
               RenderingStatsInstrumentation* rendering_stats_instrumentation);
 
   // Methods called by Tile
   friend class Tile;
   void DidChangeTilePriority(Tile* tile);
@@ skipping 93 matching lines @@
   std::vector<scoped_refptr<RasterTask> > orphan_raster_tasks_;
 
   UniqueNotifier ready_to_activate_check_notifier_;
 
   DISALLOW_COPY_AND_ASSIGN(TileManager);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_TILE_MANAGER_H_