Switch SurfaceId maps from base::hash_map to std::unordered_map.

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 <stddef.h>
 
 #include <map>
 
@@ skipping 104 matching lines @@
 
 static void UnrefHelper(base::WeakPtr<SurfaceFactory> surface_factory,
                         const ReturnedResourceArray& resources,
                         BlockingTaskRunner* main_thread_task_runner) {
   if (surface_factory)
     surface_factory->UnrefResources(resources);
 }
 
 RenderPassId SurfaceAggregator::RemapPassId(RenderPassId surface_local_pass_id,
                                             SurfaceId surface_id) {
-  RenderPassIdAllocator* allocator = render_pass_allocator_map_.get(surface_id);
+  RenderPassIdAllocator* allocator =

[danakj, 2016/01/26 23:53:32]

You could write this code a bit shorter now I guess like

scoped_ptr<RenderPassIdAllocator>& allocator =
    render_pass_..._map_[surface_id];
if (!allocator)
  allocator.reset(new RenderPass....or(&nex.._id_);

Ie.. no need to set the thing into the map if you have a reference to it
already.

[lfg, 2016/01/27 00:53:14]

Done.

+      render_pass_allocator_map_[surface_id].get();
   if (!allocator) {
     allocator = new RenderPassIdAllocator(&next_render_pass_id_);
-    render_pass_allocator_map_.set(surface_id, make_scoped_ptr(allocator));
+    render_pass_allocator_map_[surface_id] = make_scoped_ptr(allocator);
   }
   allocator->AddKnownPass(surface_local_pass_id);
   return allocator->Remap(surface_local_pass_id);
 }
 
 int SurfaceAggregator::ChildIdForSurface(Surface* surface) {
   SurfaceToResourceChildIdMap::iterator it =
       surface_id_to_resource_child_id_.find(surface->surface_id());
   if (it == surface_id_to_resource_child_id_.end()) {
     int child_id =
@@ skipping 568 matching lines @@
 
 void SurfaceAggregator::SetFullDamageForSurface(SurfaceId surface_id) {
   auto it = previous_contained_surfaces_.find(surface_id);
   if (it == previous_contained_surfaces_.end())
     return;
   // Set the last drawn index as 0 to ensure full damage next time it's drawn.
   it->second = 0;
 }
 
 }  // namespace cc