Add LatencyInfo support for Surfaces.

cc/surfaces/surface_aggregator.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_aggregator.h"
 
 #include "base/bind.h"
 #include "base/containers/hash_tables.h"
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
@@ skipping 328 matching lines @@
 
   CopyPasses(source_pass_list, surface);
 
   referenced_surfaces_.erase(it);
   DCHECK(referenced_surfaces_.empty());
 
   dest_pass_list_ = NULL;
   contained_surfaces_.swap(previous_contained_surfaces_);
   contained_surfaces_.clear();
 
+  for (SurfaceIndexMap::iterator it = previous_contained_surfaces_.begin();
+       it != previous_contained_surfaces_.end();
+       ++it) {
+    Surface* surface = manager_->GetSurfaceForId(it->first);
+    if (surface)
+      surface->TakeLatencyInfo(&frame->metadata.latency_info);
+  }
+
   // TODO(jamesr): Aggregate all resource references into the returned frame's
   // resource list.
 
   return frame.Pass();
 }
 
 }  // namespace cc