Reland "Add Linux support for the Bluetooth API"

device/bluetooth/bluetooth_adapter.h

 // Copyright (c) 2012 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 DEVICE_BLUETOOTH_BLUETOOTH_ADAPTER_H_
 #define DEVICE_BLUETOOTH_BLUETOOTH_ADAPTER_H_
 
 #include <list>
 #include <set>
 #include <string>
@@ skipping 203 matching lines @@
   // asynchronous initialization is complete.
   // Caution: The returned pointer also transfers ownership of the adapter.  The
   // caller is expected to call |AddRef()| on the returned pointer, typically by
   // storing it into a |scoped_refptr|.
   static base::WeakPtr<BluetoothAdapter> CreateAdapter(
       const InitCallback& init_callback);
 
   // Returns a weak pointer to an existing adapter for testing purposes only.
   base::WeakPtr<BluetoothAdapter> GetWeakPtrForTesting();
 
-#if defined(OS_CHROMEOS)
+#if defined(OS_CHROMEOS) || defined(OS_LINUX)
   // Shutdown the adapter: tear down and clean up all objects owned by
   // BluetoothAdapter. After this call, the BluetoothAdapter will behave as if
   // no Bluetooth controller exists in the local system. |IsPresent| will return
   // false.
   virtual void Shutdown();
 #endif
 
   // Adds and removes observers for events on this bluetooth adapter. If
   // monitoring multiple adapters, check the |adapter| parameter of observer
   // methods to determine which adapter is issuing the event.
@@ skipping 290 matching lines @@
   std::set<BluetoothDiscoverySession*> discovery_sessions_;
 
   // Note: This should remain the last member so it'll be destroyed and
   // invalidate its weak pointers before any other members are destroyed.
   base::WeakPtrFactory<BluetoothAdapter> weak_ptr_factory_;
 };
 
 }  // namespace device
 
 #endif  // DEVICE_BLUETOOTH_BLUETOOTH_ADAPTER_H_