Adding callback support to media filter Initialize() and Seek().

chrome/renderer/media/buffered_data_source.h

Index: chrome/renderer/media/buffered_data_source.h
diff --git a/chrome/renderer/media/buffered_data_source.h b/chrome/renderer/media/buffered_data_source.h
index d676142699e787f5319397d2a14d00b744b8fa4d..d7fa0809e7fc3c20b486e74db2aaf185d66a44b7 100644
--- a/chrome/renderer/media/buffered_data_source.h
+++ b/chrome/renderer/media/buffered_data_source.h
@@ -204,7 +204,8 @@ class BufferedDataSource : public media::DataSource {
         webkit_glue::MediaResourceLoaderBridgeFactory*>(
         message_loop, bridge_factory);
   }
-  virtual bool Initialize(const std::string& url);
+  virtual void Initialize(const std::string& url,
+                          media::FilterCallback* callback);
 
   // media::MediaFilter implementation.
   virtual void Stop();
@@ -261,6 +262,9 @@ class BufferedDataSource : public media::DataSource {
   // The message loop of the pipeline thread.
   MessageLoop* pipeline_loop_;
 
+  // Filter callbacks.
+  scoped_ptr<media::FilterCallback> initialize_callback_;
+
   DISALLOW_COPY_AND_ASSIGN(BufferedDataSource);
 };