Added switch that let us 'un-stub' certain dbus clients.

device/bluetooth/bluetooth_chromeos_unittest.cc

Index: device/bluetooth/bluetooth_chromeos_unittest.cc
diff --git a/device/bluetooth/bluetooth_chromeos_unittest.cc b/device/bluetooth/bluetooth_chromeos_unittest.cc
index 379d1dfd25fc6994e462d11726f63e0f80651331..87b454f17a2c6f8e7c8f2d000f86e42860fb03f7 100644
--- a/device/bluetooth/bluetooth_chromeos_unittest.cc
+++ b/device/bluetooth/bluetooth_chromeos_unittest.cc
@@ -235,6 +235,10 @@ class BluetoothChromeOSTest : public testing::Test {
  public:
   virtual void SetUp() {
     FakeDBusThreadManager* fake_dbus_thread_manager = new FakeDBusThreadManager;
+    // We need to initialize DBusThreadManager early to prevent
+    // Bluetooth*::Create() methods from picking the real instead of fake
+    // implementations.
+    DBusThreadManager::InitializeForTesting(fake_dbus_thread_manager);
     fake_bluetooth_adapter_client_ = new FakeBluetoothAdapterClient;
     fake_dbus_thread_manager->SetBluetoothAdapterClient(
         scoped_ptr<BluetoothAdapterClient>(fake_bluetooth_adapter_client_));
@@ -249,7 +253,6 @@ class BluetoothChromeOSTest : public testing::Test {
     fake_dbus_thread_manager->SetBluetoothGattServiceClient(
         scoped_ptr<BluetoothGattServiceClient>(
             new FakeBluetoothGattServiceClient));
-    DBusThreadManager::InitializeForTesting(fake_dbus_thread_manager);
 
     fake_bluetooth_adapter_client_->SetSimulationIntervalMs(10);