Add video-rendering to mojo media pipeline.

media/base/renderer.h

Index: media/base/renderer.h
diff --git a/media/base/renderer.h b/media/base/renderer.h
index 89e349a9350d1c44564690a84bdc2391589e78d2..1f3411db97c7e373bfbde708c24dd868aa8c7561 100644
--- a/media/base/renderer.h
+++ b/media/base/renderer.h
@@ -45,6 +45,7 @@ class MEDIA_EXPORT Renderer {
       const PipelineStatusCB& init_cb,
       const StatisticsCB& statistics_cb,
       const BufferingStateCB& buffering_state_cb,
+      const NaturalSizeChangedCB& natural_size_changed_cb,
       const base::Closure& ended_cb,
       const PipelineStatusCB& error_cb,
       const base::Closure& waiting_for_decryption_key_cb) = 0;