arc-bridge: Introduce the ArcService class

components/arc/intent_helper/arc_intent_helper_bridge.h

-// Copyright 2016 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 COMPONENTS_ARC_HELPER_ARC_HELPER_BRIDGE_H_
-#define COMPONENTS_ARC_HELPER_ARC_HELPER_BRIDGE_H_
-
-namespace arc {
-
-// We want ArcServiceManager to own the ArcIntentHelperBridge but
-// ArcIntentHelperBridge depends on code in chrome/ which is not accessible from
-// components/.  Since ArcIntentHelperBridge interacts with the bridge through
-// the global Get function, session manager only needs to see a limited
-// interface. Full implementation at
-// chrome/browser/chromeos/arc/arc_intent_helper_bridge_impl.h
-class ArcIntentHelperBridge {
- public:
-  virtual ~ArcIntentHelperBridge();
-
-  // Starts listening to state changes of the ArcBridgeService.
-  virtual void StartObservingBridgeServiceChanges() = 0;
-};
-
-}  // namespace arc
-
-#endif  // COMPONENTS_ARC_HELPER_ARC_HELPER_BRIDGE_H_