Add VideoImageGenerator.

media/filters/skcanvas_video_renderer.h

Index: media/filters/skcanvas_video_renderer.h
diff --git a/media/filters/skcanvas_video_renderer.h b/media/filters/skcanvas_video_renderer.h
index 3d1f4da56f76ef31b546b581bd1c85ca5ecdb2ee..917846f216ac4bb2cb05c38743fd29eb5830b206 100644
--- a/media/filters/skcanvas_video_renderer.h
+++ b/media/filters/skcanvas_video_renderer.h
@@ -5,6 +5,7 @@
 #ifndef MEDIA_FILTERS_SKCANVAS_VIDEO_RENDERER_H_
 #define MEDIA_FILTERS_SKCANVAS_VIDEO_RENDERER_H_
 
+#include "base/memory/ref_counted.h"

[rileya (GONE FROM CHROMIUM), 2014/09/03 02:42:55]

SkCanvasVideoRenderer now takes a scoped_refptr<VideoFrame> rather than a raw
pointer.

The VideoImageGenerator won't get called into by Skia until it actually needs
the pixels, so there may be some cases where the VideoFrame needs to outlive the
scope of the Paint() call in SkCanvasVideoRenderer.

Currently I don't think we run into this, but down the road I'd like to be able
to, say, hand the software compositor a SkBitmap backed by the
VideoImageGenerator and do the YUV conversion lazily.

 #include "base/time/time.h"
 #include "media/base/media_export.h"
 #include "media/base/video_rotation.h"
@@ -29,7 +30,7 @@ class MEDIA_EXPORT SkCanvasVideoRenderer {
   // specified by |dest_rect|.
   //
   // Black will be painted on |canvas| if |video_frame| is null.
-  void Paint(media::VideoFrame* video_frame,
+  void Paint(scoped_refptr<VideoFrame> video_frame,

[scherkus (not reviewing), 2014/09/03 22:51:50]

const ref

              SkCanvas* canvas,
              const gfx::RectF& dest_rect,
              uint8 alpha,
@@ -37,7 +38,7 @@ class MEDIA_EXPORT SkCanvasVideoRenderer {
              VideoRotation video_rotation);
 
   // Copy |video_frame| on |canvas|.
-  void Copy(media::VideoFrame* video_frame, SkCanvas* canvas);
+  void Copy(scoped_refptr<VideoFrame> video_frame, SkCanvas* canvas);

[scherkus (not reviewing), 2014/09/03 22:51:50]

const ref

 
  private:
   // An RGB bitmap and corresponding timestamp of the previously converted