cc: Replace Region with SimpleEnclosedRegion for occlusion tracking

cc/layers/texture_layer_impl.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_LAYERS_TEXTURE_LAYER_IMPL_H_
 #define CC_LAYERS_TEXTURE_LAYER_IMPL_H_
 
 #include <string>
 
 #include "base/callback.h"
@@ skipping 13 matching lines @@
 
   virtual scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* layer_tree_impl)
       OVERRIDE;
   virtual void PushPropertiesTo(LayerImpl* layer) OVERRIDE;
 
   virtual bool WillDraw(DrawMode draw_mode,
                         ResourceProvider* resource_provider) OVERRIDE;
   virtual void AppendQuads(RenderPass* render_pass,
                            const OcclusionTracker<LayerImpl>& occlusion_tracker,
                            AppendQuadsData* append_quads_data) OVERRIDE;
-  virtual Region VisibleContentOpaqueRegion() const OVERRIDE;
+  virtual SimpleEnclosedRegion VisibleContentOpaqueRegion() const OVERRIDE;
   virtual void ReleaseResources() OVERRIDE;
 
   // These setter methods don't cause any implicit damage, so the texture client
   // must explicitly invalidate if they intend to cause a visible change in the
   // layer's output.
   void SetTextureId(unsigned id);
   void SetPremultipliedAlpha(bool premultiplied_alpha);
   void SetBlendBackgroundColor(bool blend);
   void SetFlipped(bool flipped);
   void SetUVTopLeft(const gfx::PointF top_left);
@@ skipping 27 matching lines @@
   scoped_ptr<SingleReleaseCallback> release_callback_;
   bool own_mailbox_;
   bool valid_texture_copy_;
 
   DISALLOW_COPY_AND_ASSIGN(TextureLayerImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_TEXTURE_LAYER_IMPL_H_