Plumb media data from renderers up to MediaInternals in the browser process.

Relanding 95542. Reverted due to issue caused by 95496.

BUG=none
TEST=manually

Review URL: http://codereview.chromium.org/7480032

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@95685 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 50 insertions, 0 deletions

diff --git a/media/base/media_log.h b/media/base/media_log.h
new file mode 100644
index 0000000..fcf0c31
--- /dev/null
+++ b/media/base/media_log.h
@@ -0,0 +1,50 @@
+// Copyright (c) 2011 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_MEDIA_LOG_H_
+#define MEDIA_BASE_MEDIA_LOG_H_
+#pragma once
+
+#include "base/memory/ref_counted.h"
+#include "media/base/media_log_event.h"
+
+namespace media {
+
+class MediaLog : public base::RefCountedThreadSafe<MediaLog> {
+ public:
+
+  // Return a string to represent an EventType.
+  static const char* EventTypeToString(MediaLogEvent::Type type);
+
+  MediaLog();
+
+  // Methods called by loggers when events occur. These generate appropriate
+  // event parameters so the caller need not worry about them.
+  void Load(const std::string& url);
+
+  // Add an event to this log. Overriden by inheritors to actually do something
+  // with it.
+  // Takes ownership of |event|.
+  virtual void AddEvent(MediaLogEvent* event);
+
+  // Convenience method for adding an event with no parameters.
+  void AddEventOfType(MediaLogEvent::Type type);
+
+  // Convenience method for filling in common fields of a new event.
+  MediaLogEvent* CreateEvent(MediaLogEvent::Type type);
+
+ protected:
+  friend class base::RefCountedThreadSafe<MediaLog>;
+  virtual ~MediaLog();
+
+ private:
+  // A unique (to this process) id for this MediaLog.
+  int32 id_;
+
+  DISALLOW_COPY_AND_ASSIGN(MediaLog);
+};
+
+}  // namespace media
+
+#endif  // MEDIA_BASE_MEDIA_LOG_H_