Improving flat containers interface.

components/exo/layer_tree_frame_sink_holder.h

 // Copyright 2016 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 COMPONENTS_EXO_LAYER_TREE_FRAME_SINK_HOLDER_H_
 #define COMPONENTS_EXO_LAYER_TREE_FRAME_SINK_HOLDER_H_
 
 #include <memory>
 
 #include "base/containers/flat_map.h"
@@ skipping 40 matching lines @@
   void SetMemoryPolicy(const cc::ManagedMemoryPolicy& policy) override {}
   void SetExternalTilePriorityConstraints(
       const gfx::Rect& viewport_rect,
       const gfx::Transform& transform) override {}
 
   // Overridden from SurfaceObserver:
   void OnSurfaceDestroying(Surface* surface) override;
 
  private:
   // A collection of callbacks used to release resources.
-  using ResourceReleaseCallbackMap = base::flat_map<int, cc::ReleaseCallback>;
+  using ResourceReleaseCallbackMap =
+      base::flat_map<cc::ResourceId, cc::ReleaseCallback>;
   ResourceReleaseCallbackMap release_callbacks_;
 
   Surface* surface_;
   std::unique_ptr<cc::LayerTreeFrameSink> frame_sink_;
 
   // The next resource id the buffer is attached to.
   int next_resource_id_ = 1;
 
   base::WeakPtrFactory<LayerTreeFrameSinkHolder> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(LayerTreeFrameSinkHolder);
 };
 
 }  // namespace exo
 
 #endif  // COMPONENTS_EXO_LAYER_TREE_FRAME_SINK_HOLDER_H_