Move Renderer permanent callbacks into RendererClient interface.

media/base/renderer_client.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 MEDIA_BASE_RENDERER_CLIENT_H_
+#define MEDIA_BASE_RENDERER_CLIENT_H_
+
+namespace media {
+
+class RendererClient {

[xhwang, 2016/05/09 18:13:22]

Please add some documentation for this interface.

You can also mention that this interface is shared by Renderer, AudioRenderer
and VideoRenderer.

[alokp, 2016/05/09 21:31:43]

Done.

+ public:
+  virtual void OnError(PipelineStatus status) = 0;
+  virtual void OnEnded() = 0;
+  virtual void OnStatisticsUpdate(const PipelineStatistics& stats) = 0;
+  virtual void OnBufferingStateChange(BufferingState state) = 0;
+  virtual void OnWaitingForDecryptionKey() = 0;
+};
+
+}  // namespace media
+
+#endif  // MEDIA_BASE_RENDERER_CLIENT_H_