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

cc/surfaces/surface_factory.cc

 // 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.
 
 #include "cc/surfaces/surface_factory.h"
 
 #include <utility>
 
 #include "base/trace_event/trace_event.h"
 #include "cc/output/compositor_frame.h"
@@ skipping 35 matching lines @@
 
 void SurfaceFactory::Destroy(SurfaceId surface_id) {
   OwningSurfaceMap::iterator it = surface_map_.find(surface_id);
   DCHECK(it != surface_map_.end());
   DCHECK(it->second->factory().get() == this);
   std::unique_ptr<Surface> surface(std::move(it->second));
   surface_map_.erase(it);
   manager_->Destroy(std::move(surface));
 }
 
+void SurfaceFactory::SetPreviousFrameSurface(SurfaceId new_id,
+                                             SurfaceId old_id) {
+  OwningSurfaceMap::iterator it = surface_map_.find(new_id);
+  DCHECK(it != surface_map_.end());
+  Surface* old_surface = manager_->GetSurfaceForId(old_id);
+  if (old_surface) {
+    it->second->SetPreviousFrameSurface(old_surface);
+  }
+}
+
 void SurfaceFactory::SubmitCompositorFrame(
     SurfaceId surface_id,
     std::unique_ptr<CompositorFrame> frame,
     const DrawCallback& callback) {
   TRACE_EVENT0("cc", "SurfaceFactory::SubmitCompositorFrame");
   OwningSurfaceMap::iterator it = surface_map_.find(surface_id);
   DCHECK(it != surface_map_.end());
   DCHECK(it->second->factory().get() == this);
   it->second->QueueFrame(std::move(frame), callback);
   if (!manager_->SurfaceModified(surface_id)) {
@@ skipping 27 matching lines @@
 
 void SurfaceFactory::RefResources(const TransferableResourceArray& resources) {
   holder_.RefResources(resources);
 }
 
 void SurfaceFactory::UnrefResources(const ReturnedResourceArray& resources) {
   holder_.UnrefResources(resources);
 }
 
 }  // namespace cc