Implementing preload=metadata for video

webkit/glue/media/buffered_data_source.h

Index: webkit/glue/media/buffered_data_source.h
diff --git a/webkit/glue/media/buffered_data_source.h b/webkit/glue/media/buffered_data_source.h
index 2c9e9046fb14ac2d47100ada8f87d4d79a15f743..933ffb9139fdbd775e11c58a43e18e068947019e 100644
--- a/webkit/glue/media/buffered_data_source.h
+++ b/webkit/glue/media/buffered_data_source.h
@@ -11,6 +11,7 @@
 #include "base/memory/scoped_ptr.h"
 #include "base/synchronization/lock.h"
 #include "media/base/filter_factories.h"
+#include "media/base/filters.h"
 #include "webkit/glue/media/buffered_resource_loader.h"
 
 namespace webkit_glue {
@@ -40,6 +41,7 @@ class BufferedDataSource : public WebDataSource {
                     media::DataSource::ReadCallback* read_callback);
   virtual bool GetSize(int64* size_out);
   virtual bool IsStreaming();
+  virtual void SetPreload(media::Preload preload);
 
   const media::MediaFormat& media_format() {
     return media_format_;
@@ -90,6 +92,13 @@ class BufferedDataSource : public WebDataSource {
   // and signals the buffered resource loader accordingly.
   void SetPlaybackRateTask(float playback_rate);
 
+  // This task saves the preload value for the media.
+  void SetPreloadTask(media::Preload preload);
+
+  // Decides which DeferStrategy to used based on the current state of the
+  // BufferedDataSource.
+  BufferedResourceLoader::DeferStrategy ChooseDeferStrategy();
+
   // The method that performs actual read. This method can only be executed on
   // the render thread.
   void ReadInternal();
@@ -196,6 +205,14 @@ class BufferedDataSource : public WebDataSource {
   // are in a playing state.
   bool media_is_paused_;
 
+  // This variable is true when the user has requested the video to play at
+  // least once.
+  bool media_has_played_;
+
+  // This variable holds the value of the preload attribute for the video
+  // element.
+  media::Preload preload_;
+
   // This timer is to run the WatchDogTask repeatedly. We use a timer instead
   // of doing PostDelayedTask() reduce the extra reference held by the message
   // loop. The RepeatingTimer does PostDelayedTask() internally, by using it