Remove limit on number of resources in cc

cc/resources/tile_manager.h

Index: cc/resources/tile_manager.h
diff --git a/cc/resources/tile_manager.h b/cc/resources/tile_manager.h
index 6f579f9fb1c9dde8baa82cd233604482f0e00f5f..8f95c54689adfe42bb83543717348d208aa545b9 100644
--- a/cc/resources/tile_manager.h
+++ b/cc/resources/tile_manager.h
@@ -188,26 +188,7 @@ class CC_EXPORT TileManager : public RasterizerClient,
   void AssignGpuMemoryToTiles(TileVector* tiles_that_need_to_be_rasterized);
 
  private:
-  class MemoryUsage {
-   public:
-    MemoryUsage();
-    MemoryUsage(int64 memory_bytes, int resource_count);
-
-    static MemoryUsage FromConfig(const gfx::Size& size, ResourceFormat format);
-    static MemoryUsage FromTile(const Tile* tile);
-
-    MemoryUsage& operator+=(const MemoryUsage& other);
-    MemoryUsage& operator-=(const MemoryUsage& other);
-    MemoryUsage operator-(const MemoryUsage& other);
-
-    bool Exceeds(const MemoryUsage& limit) const;
-    int64 memory_bytes() const { return memory_bytes_; }
-
-   private:
-    int64 memory_bytes_;
-    int resource_count_;
-  };
-
+  using MemoryUsage = int64_t;
   void OnImageDecodeTaskCompleted(int layer_id,
                                   SkPixelRef* pixel_ref,
                                   bool was_canceled);
@@ -223,15 +204,18 @@ class CC_EXPORT TileManager : public RasterizerClient,
   scoped_refptr<RasterTask> CreateRasterTask(Tile* tile);
 
   void RebuildEvictionQueueIfNeeded();
-  bool FreeTileResourcesUntilUsageIsWithinLimit(const MemoryUsage& limit,
+  bool FreeTileResourcesUntilUsageIsWithinLimit(MemoryUsage limit,
                                                 MemoryUsage* usage);
   bool FreeTileResourcesWithLowerPriorityUntilUsageIsWithinLimit(
-      const MemoryUsage& limit,
+      MemoryUsage limit,
       const TilePriority& oother_priority,
       MemoryUsage* usage);
   bool TilePriorityViolatesMemoryPolicy(const TilePriority& priority);
   bool IsReadyToActivate() const;
   void CheckIfReadyToActivate();
+  MemoryUsage MemoryUsageFromConfig(const gfx::Size& size,
+                                    ResourceFormat format);
+  MemoryUsage MemoryUsageFromTile(const Tile* tile);
 
   TileManagerClient* client_;
   scoped_refptr<base::SequencedTaskRunner> task_runner_;