Splitting media filter's Initialize() into Create() + callback and Seek() + callback.

media/filters/file_data_source.h

Index: media/filters/file_data_source.h
diff --git a/media/filters/file_data_source.h b/media/filters/file_data_source.h
index e58e4aa588482d57cddd2a51e75bb2879175b558..5c91ce18fa71db3371394447b736cbbb6ce8764c 100644
--- a/media/filters/file_data_source.h
+++ b/media/filters/file_data_source.h
@@ -26,7 +26,7 @@ class FileDataSource : public DataSource {
   virtual void Stop();
 
   // Implementation of DataSource.
-  virtual bool Initialize(const std::string& url);
+  virtual void Initialize(const std::string& url, FilterCallback* callback);
   virtual const MediaFormat& media_format();
   virtual size_t Read(uint8* data, size_t size);
   virtual bool GetPosition(int64* position_out);
@@ -41,6 +41,7 @@ class FileDataSource : public DataSource {
   // of my tests!!!
   FRIEND_TEST(FileDataSourceTest, OpenFile);
   FRIEND_TEST(FileDataSourceTest, ReadData);
+  FRIEND_TEST(FileDataSourceTest, Seek);
   friend class FilterFactoryImpl0<FileDataSource>;
   FileDataSource();
   virtual ~FileDataSource();