Log PipelineImpl events to MediaLog.

media/base/media_log.h

 // 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"
+#include "media/base/pipeline_impl.h"
 
 namespace media {
 
 class MediaLog : public base::RefCountedThreadSafe<MediaLog> {
  public:
-  // Return a string to represent an EventType.
+  // Convert various enums to strings.
   static const char* EventTypeToString(MediaLogEvent::Type type);
+  static const char* PipelineStateToString(PipelineImpl::State);
 
   MediaLog();
 
   // Add an event to this log. Overriden by inheritors to actually do something
   // with it.
   // Takes ownership of |event|.
   virtual void AddEvent(MediaLogEvent* event);
 
   // Helper methods to create events and their parameters.
   MediaLogEvent* CreateEvent(MediaLogEvent::Type type);
   MediaLogEvent* CreateLoadEvent(const std::string& url);
+  MediaLogEvent* CreateSeekEvent(float seconds);
+  MediaLogEvent* CreatePipelineStateChangedEvent(PipelineImpl::State state);
   MediaLogEvent* CreateBufferedExtentsChangedEvent(size_t start, size_t current,
                                                    size_t end);
 
  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_