Implemented Asynchronous Initialization of BluetoothAdapter.

device/bluetooth/bluetooth_adapter_factory.h

Index: device/bluetooth/bluetooth_adapter_factory.h
diff --git a/device/bluetooth/bluetooth_adapter_factory.h b/device/bluetooth/bluetooth_adapter_factory.h
index f2203aa7cbc6f5296abc24503370727ea775896b..49753376ed834fe72d06bb85102ab806e132db88 100644
--- a/device/bluetooth/bluetooth_adapter_factory.h
+++ b/device/bluetooth/bluetooth_adapter_factory.h
@@ -18,18 +18,23 @@ namespace device {
 // adapter" which may change depending on availability.
 class BluetoothAdapterFactory {
  public:
+  typedef base::Callback<void(scoped_refptr<BluetoothAdapter> adapter)>
+      AdapterCallback;
+
   // Returns true if the Bluetooth adapter is available for the current
   // platform.
   static bool IsBluetoothAdapterAvailable();
 
-  // Runs the callback with the shared instance for the default adapter when the
-  // adapter is available to be used.
-  static void RunCallbackOnAdapterReady(
-      const BluetoothAdapter::AdapterCallback& callback);
+  // Returns the shared instance of the default adapter, creating and
+  // initializing it if necessary. |callback| is called with the adapter
+  // instance passed only once the adapter is fully initialized and ready to
+  // use.
+  static void GetAdapter(const AdapterCallback& callback);
 
-  // Returns the shared instance of the adapter that has already been created.
+  // Returns the shared instance of the adapter that has already been created,
+  // but may or may not have been initialized.
   // It returns NULL if no adapter has been created at the time.
-  static scoped_refptr<BluetoothAdapter> GetAdapter();
+  static scoped_refptr<BluetoothAdapter> MaybeGetAdapter();
 
   // Creates an instance for a specific adapter at address |address|.
   static BluetoothAdapter* Create(const std::string& address);