cc: Only add surface ID to embedded_surfaces if fallback does not match

cc/layers/surface_layer_impl.h

 // Copyright 2014 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_SURFACE_LAYER_IMPL_H_
 #define CC_LAYERS_SURFACE_LAYER_IMPL_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 12 matching lines @@
                                                   int id) {
     return base::WrapUnique(new SurfaceLayerImpl(tree_impl, id));
   }
   ~SurfaceLayerImpl() override;
 
   void SetPrimarySurfaceInfo(const SurfaceInfo& surface_info);
   const SurfaceInfo& primary_surface_info() const {
     return primary_surface_info_;
   }
 
+  // A fallback Surface is a Surface that is already known to exist in the
+  // display compositor. If surface synchronization is enabled, the display
+  // compositor will use the fallback if the primary surface is unavailable
+  // at the time of surface aggregation. If surface synchronization is not
+  // enabled, then a fallback surface will not be specified.
   void SetFallbackSurfaceInfo(const SurfaceInfo& surface_info);
   const SurfaceInfo& fallback_surface_info() const {
     return fallback_surface_info_;
   }
 
   void SetStretchContentToFillBounds(bool stretch_content);
 
   // LayerImpl overrides.
   std::unique_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl) override;
   void PushPropertiesTo(LayerImpl* layer) override;
   void AppendQuads(RenderPass* render_pass,
                    AppendQuadsData* append_quads_data) override;
 
  protected:
   SurfaceLayerImpl(LayerTreeImpl* tree_impl, int id);
 
  private:
   SurfaceDrawQuad* CreateSurfaceDrawQuad(
       RenderPass* render_pass,
       SurfaceDrawQuadType surface_draw_quad_type,
       const SurfaceInfo& surface_info,
-      std::vector<SurfaceId>* embedded_surfaces,
       SharedQuadState** common_shared_quad_state);
 
   void GetDebugBorderProperties(SkColor* color, float* width) const override;
   void AppendRainbowDebugBorder(RenderPass* render_pass);
   void AsValueInto(base::trace_event::TracedValue* dict) const override;
   const char* LayerTypeAsString() const override;
 
   SurfaceInfo primary_surface_info_;
   SurfaceInfo fallback_surface_info_;
 
   bool stretch_content_to_fill_bounds_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(SurfaceLayerImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_SURFACE_LAYER_IMPL_H_