Media Remoting: Add mojo interfaces between browser and extension.

media/mojo/interfaces/remoting_common.mojom

Index: media/mojo/interfaces/remoting_common.mojom
diff --git a/media/mojo/interfaces/remoting_common.mojom b/media/mojo/interfaces/remoting_common.mojom
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+// Copyright 2017 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.
+
+module media.mojom;
+
+enum RemotingStopReason {
+  ROUTE_TERMINATED,  // User-initiated disconnect, etc.
+  LOCAL_PLAYBACK,  // Media switched back to local playback.
+  SOURCE_GONE,  // RemotingSource has been destroyed.
+  MESSAGE_SEND_FAILED,  // Failed to send a message to the sink.
+  DATA_SEND_FAILED,  // Failed to consume from a data pipe or send to the sink.
+  UNEXPECTED_FAILURE,  // Unexpected failure or inconsistent state encountered.
+};
+
+// TODO(xjz): Add capabilities with supported Audio/Video Codecs.
+enum RemotingSinkCapabilities {
+  NONE,
+  RENDERING_ONLY,
+  CONTENT_DECRYPTION_AND_RENDERING,
+};
+
+enum RemotingStartFailReason {
+  CANNOT_START_MULTIPLE,  // Remoting was already active.
+  ROUTE_TERMINATED,  // User-initated disconnect while starting remoting.
+  SERVICE_NOT_CONNECTED,  // Mirror service was not connected.
+  SERVICE_START_REMOTING_ERROR,  // Failed to start remoting in mirror service.
+};