WIP - WebMediaPlayer switch media renderer.

media/base/mediaplayer_observer.h

Index: media/base/mediaplayer_observer.h
diff --git a/media/base/mediaplayer_observer.h b/media/base/mediaplayer_observer.h
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+++ b/media/base/mediaplayer_observer.h
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+// 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_MEDIAPLAYER_OBSERVER_H_
+#define MEDIA_BASE_MEDIAPLAYER_OBSERVER_H_
+
+#include "base/callback.h"
+#include "media/base/audio_decoder_config.h"
+#include "media/base/cdm_context.h"
+#include "media/base/video_decoder_config.h"
+
+namespace media {
+
+// This class is an observer of media player events.
+class MEDIA_EXPORT MediaPlayerObserver {
+ public:
+  MediaPlayerObserver();
+  virtual ~MediaPlayerObserver();
+
+  // Called when the media element or its ancestor is entered/exited fullscreen.
+  virtual void OnEnteredFullscreen() = 0;
+  virtual void OnExitedFullscreen() = 0;
+
+  // Called when CDM is attached to the media element.
+  virtual void OnSetCdm(CdmContext* cdm_context) = 0;
+
+  // Set video/audio config after demuxer is initialized.
+  virtual void OnDecoderConfigChanged(
+      const AudioDecoderConfig& audio_config,
+      const VideoDecoderConfig& video_config) = 0;
+};
+
+}  // namespace media
+
+#endif  // MEDIA_BASE_MEDIAPLAYER_OBSERVER_H_