preparation for recycling buffer, patch 2

media/filters/video_decode_engine.h

Index: media/filters/video_decode_engine.h
diff --git a/media/filters/video_decode_engine.h b/media/filters/video_decode_engine.h
index 8dc9d252d16c0d611706f52d9da4916002f550ea..3efe647f4f18c025f6c2df65e71a44e44fcf46aa 100644
--- a/media/filters/video_decode_engine.h
+++ b/media/filters/video_decode_engine.h
@@ -26,6 +26,7 @@ class VideoDecodeEngine {
     kCreated,
     kNormal,
     kStopped,
+    kFlushing,
     kError,
   };
 
@@ -65,6 +66,7 @@ class VideoDecodeEngine {
 
   virtual void Stop(Task* done_cb) = 0;
   virtual void Pause(Task* done_cb) = 0;
+  virtual void Seek(Task* done_cb) = 0;
 
   // Flushes the decode engine of any buffered input packets.
   virtual void Flush(Task* done_cb) = 0;
@@ -73,6 +75,8 @@ class VideoDecodeEngine {
   // DecodeFrame().
   virtual VideoFrame::Format GetSurfaceFormat() const = 0;
 
+  virtual bool ProvidesBuffer() const = 0;
+
   // Returns the current state of the decode engine.
   virtual State state() const  = 0;
 };