V4L2SVDA/VAAPIVDA: use visible size from decoder and pass to client

media/gpu/vp9_picture.h

Index: media/gpu/vp9_picture.h
diff --git a/media/gpu/vp9_picture.h b/media/gpu/vp9_picture.h
index 7c026fa2ea91b1c72d9014dba623a61da5bd8230..5b774ce062b9b028f65b9e3f44ff12425d8290fd 100644
--- a/media/gpu/vp9_picture.h
+++ b/media/gpu/vp9_picture.h
@@ -10,6 +10,7 @@
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "media/filters/vp9_parser.h"
+#include "ui/gfx/geometry/rect.h"
 
 namespace media {
 
@@ -25,6 +26,11 @@ class VP9Picture : public base::RefCounted<VP9Picture> {
 
   std::unique_ptr<Vp9FrameHeader> frame_hdr;
 
+  // The visible size of picture. This could be either parsed from frame
+  // header, or set to gfx::Rect(0, 0) for indicating the client using the
+  // visible size extracted from the container instead.
+  gfx::Rect visible_rect;
+
  protected:
   friend class base::RefCounted<VP9Picture>;
   virtual ~VP9Picture();