Add OnDurationChange() to RenderClient

media/base/renderer_client.h

Index: media/base/renderer_client.h
diff --git a/media/base/renderer_client.h b/media/base/renderer_client.h
index 49b098e70511d3ecc978794e3013c34e7ebd52b6..402c31b2e877db6a9a2b292392df282d9bb5efc9 100644
--- a/media/base/renderer_client.h
+++ b/media/base/renderer_client.h
@@ -5,13 +5,14 @@
 #ifndef MEDIA_BASE_RENDERER_CLIENT_H_
 #define MEDIA_BASE_RENDERER_CLIENT_H_
 
+#include "base/time/time.h"
 #include "media/base/pipeline_status.h"
 #include "ui/gfx/geometry/size.h"
 
 namespace media {
 
-// Interface used by Renderer, AudioRenderer, and VideoRenderer implementations
-// to notify their clients.
+// Interface used by Renderer, AudioRenderer, VideoRenderer and
+// MediaPlayerRenderer implementations to notify their clients.
 class RendererClient {
  public:
   // Executed if any error was encountered after Renderer initialization.
@@ -36,6 +37,10 @@ class RendererClient {
   // Executed for the first video frame and whenever opacity changes.
   // Only used if media stream contains video track.
   virtual void OnVideoOpacityChange(bool opaque) = 0;
+
+  // Executed when video metadata is first read, and whenever it changes.
+  // Only used when we are using a URL demuxer (e.g. for MediaPlayerRenderer).
+  virtual void OnDurationChange(base::TimeDelta duration) = 0;
 };
 
 }  // namespace media