cc: Rationalize sync points and lost status for returned resources

cc/layers/delegated_frame_resource_collection.cc

 // Copyright 2013 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/layers/delegated_frame_resource_collection.h"
 
 #include "base/bind.h"
 #include "cc/trees/blocking_task_runner.h"
 
 namespace cc {
@@ skipping 70 matching lines @@
     return;
 
   ReturnedResourceArray to_return;
 
   for (size_t i = 0; i < returned.size(); ++i) {
     ResourceIdRefCountMap::iterator it =
         resource_id_ref_count_map_.find(returned[i].id);
     DCHECK(it != resource_id_ref_count_map_.end());
     DCHECK_GE(it->second.refs_to_wait_for, returned[i].count);
     it->second.refs_to_wait_for -= returned[i].count;
+    it->second.lost |= returned[i].lost;
+    if (returned[i].sync_point)
+      it->second.sync_point = returned[i].sync_point;
     if (it->second.refs_to_wait_for == 0) {
       to_return.push_back(returned[i]);
       to_return.back().count = it->second.refs_to_return;
+      to_return.back().sync_point = it->second.sync_point;
+      to_return.back().lost = it->second.lost;
       resource_id_ref_count_map_.erase(it);
     }
   }
 
   if (to_return.empty())
     return;
 
   returned_resources_for_child_compositor_.insert(
       returned_resources_for_child_compositor_.end(),
       to_return.begin(),
@@ skipping 20 matching lines @@
 }
 
 ReturnCallback
 DelegatedFrameResourceCollection::GetReturnResourcesCallbackForImplThread() {
   return base::Bind(&UnrefResourcesOnImplThread,
                     weak_ptr_factory_.GetWeakPtr(),
                     main_thread_runner_);
 }
 
 }  // namespace cc