Rename cc::ResourceProvider::ResourceId to cc::ResourceId and move it to its own file.

cc/resources/returned_resource.h

 // 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.
 
 #ifndef CC_RESOURCES_RETURNED_RESOURCE_H_
 #define CC_RESOURCES_RETURNED_RESOURCE_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "cc/base/cc_export.h"
+#include "cc/resources/resource_id.h"
 
 namespace cc {
 
 struct CC_EXPORT ReturnedResource {
   ReturnedResource() : id(0), sync_point(0), count(0), lost(false) {}
-  unsigned id;
+  ResourceId id;
   unsigned sync_point;
   int count;
   bool lost;
 };
 
 typedef std::vector<ReturnedResource> ReturnedResourceArray;
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_RETURNED_RESOURCE_H_