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 5ab30358d0000481d4c09ae550904ec6478bb6ef..ea8c3302f39e5142c4845322454839ed8f0598d9 100644
--- a/webkit/glue/media/buffered_data_source.h
+++ b/webkit/glue/media/buffered_data_source.h
@@ -11,6 +11,7 @@
 #include "base/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 {
@@ -32,6 +33,11 @@ class BufferedDataSource : public WebDataSource {
   virtual void set_host(media::FilterHost* host);
   virtual void Stop(media::FilterCallback* callback);
   virtual void SetPlaybackRate(float playback_rate);
+  virtual void SetPreload(media::Preload preload);
+
+  // Decides which DeferStrategy to used based on the current state of the
+  // BufferedDataSource.
+  DeferStrategy* ChooseDeferStrategy();
 
   // media::DataSource implementation.
   // Called from demuxer thread.
@@ -89,6 +95,7 @@ class BufferedDataSource : public WebDataSource {
   // to determine whether we are going from pause to play and play to pause,
   // and signals the buffered resource loader accordingly.
   void SetPlaybackRateTask(float playback_rate);
+  void SetPreloadTask(media::Preload preload);
 
   // The method that performs actual read. This method can only be executed on
   // the render thread.
@@ -196,6 +203,14 @@ 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