cc: Pass Occlusion instead of OcclusionTracker to LayerImpls

cc/layers/picture_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_PICTURE_LAYER_IMPL_H_
 #define CC_LAYERS_PICTURE_LAYER_IMPL_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 89 matching lines @@
     return make_scoped_ptr(new PictureLayerImpl(tree_impl, id));
   }
   virtual ~PictureLayerImpl();
 
   // LayerImpl overrides.
   virtual const char* LayerTypeAsString() const override;
   virtual scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl)
       override;
   virtual void PushPropertiesTo(LayerImpl* layer) override;
   virtual void AppendQuads(RenderPass* render_pass,
-                           const OcclusionTracker<LayerImpl>& occlusion_tracker,
+                           const Occlusion& occlusion_in_content_space,
                            AppendQuadsData* append_quads_data) override;
   virtual void UpdateTiles(const Occlusion& occlusion_in_content_space,
                            bool resourceless_software_draw) override;
   virtual void NotifyTileStateChanged(const Tile* tile) override;
   virtual void DidBecomeActive() override;
   virtual void DidBeginTracing() override;
   virtual void ReleaseResources() override;
   virtual skia::RefPtr<SkPicture> GetPicture() override;
 
   // PictureLayerTilingClient overrides.
@@ skipping 107 matching lines @@
   gfx::Rect viewport_rect_for_tile_priority_;
   gfx::Transform screen_space_transform_for_tile_priority_;
 
   friend class PictureLayer;
   DISALLOW_COPY_AND_ASSIGN(PictureLayerImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_PICTURE_LAYER_IMPL_H_