Revert of Delete unused file mediacommon.h.

webrtc/media/base/mediacommon.h

Index: webrtc/media/base/mediacommon.h
diff --git a/webrtc/media/base/mediacommon.h b/webrtc/media/base/mediacommon.h
new file mode 100644
index 0000000000000000000000000000000000000000..c760463b8cce5d7075fba2b3ca6c8fdf5955629a
--- /dev/null
+++ b/webrtc/media/base/mediacommon.h
@@ -0,0 +1,27 @@
+/*
+ *  Copyright (c) 2004 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_MEDIA_BASE_MEDIACOMMON_H_
+#define WEBRTC_MEDIA_BASE_MEDIACOMMON_H_
+
+#include "webrtc/base/stringencode.h"
+
+namespace cricket {
+
+enum MediaCapabilities {
+  AUDIO_RECV = 1 << 0,
+  AUDIO_SEND = 1 << 1,
+  VIDEO_RECV = 1 << 2,
+  VIDEO_SEND = 1 << 3,
+};
+
+}  // namespace cricket
+
+#endif  // WEBRTC_MEDIA_BASE_MEDIACOMMON_H_