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

webkit/glue/media/simple_data_source.h

Index: webkit/glue/media/simple_data_source.h
diff --git a/webkit/glue/media/simple_data_source.h b/webkit/glue/media/simple_data_source.h
index 79180348c319f1f9c5a4a9e94ea5da04cdc739f0..8a63df40ea04a2738f24fda881b9e7feb254175c 100644
--- a/webkit/glue/media/simple_data_source.h
+++ b/webkit/glue/media/simple_data_source.h
@@ -38,7 +38,8 @@ class SimpleDataSource : public media::DataSource,
   virtual void Stop();
 
   // DataSource implementation.
-  virtual bool Initialize(const std::string& url);
+  virtual void Initialize(const std::string& url,
+                          media::FilterCallback* callback);
   virtual const media::MediaFormat& media_format();
   virtual size_t Read(uint8* data, size_t size);
   virtual bool GetPosition(int64* position_out);
@@ -104,6 +105,9 @@ class SimpleDataSource : public media::DataSource,
   // Used for accessing |state_|.
   Lock lock_;
 
+  // Filter callbacks.
+  scoped_ptr<media::FilterCallback> initialize_callback_;
+
   DISALLOW_COPY_AND_ASSIGN(SimpleDataSource);
 };