[Sync] Initial USS service implementation for DeviceInfo.

components/sync_driver/local_device_info_provider_mock.cc

Index: components/sync_driver/local_device_info_provider_mock.cc
diff --git a/components/sync_driver/local_device_info_provider_mock.cc b/components/sync_driver/local_device_info_provider_mock.cc
index 604d194ff228063dfc4b53ce70dba2e4f4ecbadb..8c22b8bfee867a43c5d29cb8238868a7099f3017 100644
--- a/components/sync_driver/local_device_info_provider_mock.cc
+++ b/components/sync_driver/local_device_info_provider_mock.cc
@@ -46,6 +46,12 @@ void LocalDeviceInfoProviderMock::Initialize(
   // Ignored for the mock provider.
 }
 
+void LocalDeviceInfoProviderMock::Initialize(
+    scoped_ptr<DeviceInfo> local_device_info) {
+  local_device_info_.swap(local_device_info);
+  SetInitialized(true);
+}
+
 scoped_ptr<LocalDeviceInfoProvider::Subscription>
 LocalDeviceInfoProviderMock::RegisterOnInitializedCallback(
     const base::Closure& callback) {