Surface Synchronization: Distinguish between dependencies and references

cc/surfaces/surface.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_SURFACES_SURFACE_H_
 #define CC_SURFACES_SURFACE_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 88 matching lines @@
       std::unordered_set<FrameSinkId, FrameSinkIdHash>* valid_id_namespaces);
   size_t GetDestructionDependencyCount() const {
     return destruction_dependencies_.size();
   }
 
   const std::vector<SurfaceId>* active_referenced_surfaces() const {
     return active_frame_ ? &active_frame_->metadata.referenced_surfaces
                          : nullptr;
   }
 
-  const std::vector<SurfaceId>* pending_referenced_surfaces() const {
-    return pending_frame_ ? &pending_frame_->metadata.referenced_surfaces
-                          : nullptr;
-  }
-
   const SurfaceDependencies& blocking_surfaces() const {
     return blocking_surfaces_;
   }
 
   bool HasActiveFrame() const { return active_frame_.has_value(); }
   bool HasPendingFrame() const { return pending_frame_.has_value(); }
 
   bool destroyed() const { return destroyed_; }
   void set_destroyed(bool destroyed) { destroyed_ = destroyed; }
 
@@ skipping 32 matching lines @@
   base::ObserverList<PendingFrameObserver, true> observers_;
 
   DrawCallback draw_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(Surface);
 };
 
 }  // namespace cc
 
 #endif  // CC_SURFACES_SURFACE_H_