cc: Pass Occlusion instead of OcclusionTracker to LayerImpls

cc/test/fake_picture_layer_impl.h

 // Copyright 2013 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_TEST_FAKE_PICTURE_LAYER_IMPL_H_
 #define CC_TEST_FAKE_PICTURE_LAYER_IMPL_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "cc/layers/picture_layer_impl.h"
 
@@ skipping 18 matching lines @@
       int id,
       scoped_refptr<PicturePileImpl> pile,
       const gfx::Size& layer_bounds) {
     return make_scoped_ptr(
         new FakePictureLayerImpl(tree_impl, id, pile, layer_bounds));
   }
 
   virtual scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl)
       override;
   virtual void AppendQuads(RenderPass* render_pass,
-                           const OcclusionTracker<LayerImpl>& occlusion_tracker,
+                           const Occlusion& occlusion_in_content_space,
                            AppendQuadsData* append_quads_data) override;
   virtual gfx::Size CalculateTileSize(
       const gfx::Size& content_bounds) const override;
 
   virtual void DidBecomeActive() override;
   size_t did_become_active_call_count() {
     return did_become_active_call_count_;
   }
 
   virtual bool HasValidTilePriorities() const override;
@@ skipping 84 matching lines @@
   size_t append_quads_count_;
   size_t did_become_active_call_count_;
   bool has_valid_tile_priorities_;
   bool use_set_valid_tile_priorities_flag_;
   size_t release_resources_count_;
 };
 
 }  // namespace cc
 
 #endif  // CC_TEST_FAKE_PICTURE_LAYER_IMPL_H_