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

media/gpu/vp8_decoder.h

Index: media/gpu/vp8_decoder.h
diff --git a/media/gpu/vp8_decoder.h b/media/gpu/vp8_decoder.h
index 549271fb415523f4d9e8404c1142fe07a5933249..8291ec9349f93963a41c6e3eb198f3841ea21010 100644
--- a/media/gpu/vp8_decoder.h
+++ b/media/gpu/vp8_decoder.h
@@ -15,6 +15,7 @@
 #include "media/filters/vp8_parser.h"
 #include "media/gpu/accelerated_video_decoder.h"
 #include "media/gpu/vp8_picture.h"
+#include "ui/gfx/geometry/rect.h"
 
 namespace media {
 
@@ -57,7 +58,8 @@ class MEDIA_GPU_EXPORT VP8Decoder : public AcceleratedVideoDecoder {
     // as this method was called for them. Decoder may drop its reference
     // to |pic| after calling this method.
     // Return true if successful.
-    virtual bool OutputPicture(const scoped_refptr<VP8Picture>& pic) = 0;
+    virtual bool OutputPicture(const scoped_refptr<VP8Picture>& pic,
+                               const gfx::Rect& visible_rect) = 0;
 
    private:
     DISALLOW_COPY_AND_ASSIGN(VP8Accelerator);