Implementing preload=metadata for video

media/base/pipeline.h

Index: media/base/pipeline.h
diff --git a/media/base/pipeline.h b/media/base/pipeline.h
index 0df1bd3e7fccea2c96f6398d45c1eb31ccfc673f..ca7727ad3af315459d347c6afa7437150d32c81a 100644
--- a/media/base/pipeline.h
+++ b/media/base/pipeline.h
@@ -12,6 +12,7 @@
 #include <string>
 
 #include "base/callback.h"
+#include "media/base/filters.h"
 #include "media/base/pipeline_status.h"
 
 namespace base {
@@ -124,6 +125,9 @@ class Pipeline : public base::RefCountedThreadSafe<Pipeline> {
   // channels proportionately for multi-channel audio streams.
   virtual void SetVolume(float volume) = 0;
 
+  // Set the preload value for the pipeline.
+  virtual void SetPreload(Preload preload) = 0;
+
   // Gets the current pipeline time. For a pipeline "time" progresses from 0 to
   // the end of the media.
   virtual base::TimeDelta GetCurrentTime() const = 0;