Add way to mark other Surface a predecessor for a Surface.

cc/surfaces/surface_factory.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_FACTORY_H_
 #define CC_SURFACES_SURFACE_FACTORY_H_
 
 #include <memory>
 #include <set>
 #include <unordered_map>
@@ skipping 31 matching lines @@
  public:
   using DrawCallback = base::Callback<void(SurfaceDrawStatus)>;
 
   SurfaceFactory(SurfaceManager* manager, SurfaceFactoryClient* client);
   ~SurfaceFactory();
 
   void Create(SurfaceId surface_id);
   void Destroy(SurfaceId surface_id);
   void DestroyAll();
 
+  // Set that the current frame on new_id is to be treated as the successor to
+  // the current frame on old_id for the purposes of calculating damage.
+  void SetPreviousFrameSurface(SurfaceId new_id, SurfaceId old_id);
+
   // A frame can only be submitted to a surface created by this factory,
   // although the frame may reference surfaces created by other factories.
   // The callback is called the first time this frame is used to draw, or if
   // the frame is discarded.
   void SubmitCompositorFrame(SurfaceId surface_id,
                              std::unique_ptr<CompositorFrame> frame,
                              const DrawCallback& callback);
   void RequestCopyOfSurface(SurfaceId surface_id,
                             std::unique_ptr<CopyOutputRequest> copy_request);
 
@@ skipping 23 matching lines @@
   using OwningSurfaceMap =
       std::unordered_map<SurfaceId, std::unique_ptr<Surface>, SurfaceIdHash>;
   OwningSurfaceMap surface_map_;
 
   DISALLOW_COPY_AND_ASSIGN(SurfaceFactory);
 };
 
 }  // namespace cc
 
 #endif  // CC_SURFACES_SURFACE_FACTORY_H_