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

media/gpu/h264_decoder.cc

Index: media/gpu/h264_decoder.cc
diff --git a/media/gpu/h264_decoder.cc b/media/gpu/h264_decoder.cc
index aed9658374805c9854aaf4c0fa76dc34e67a5412..be23b6cd68de5f5490c0319c805acf4ac7191c34 100644
--- a/media/gpu/h264_decoder.cc
+++ b/media/gpu/h264_decoder.cc
@@ -673,7 +673,7 @@ void H264Decoder::OutputPic(scoped_refptr<H264Picture> pic) {
   last_output_poc_ = pic->pic_order_cnt;
 
   DVLOG(4) << "Posting output task for POC: " << pic->pic_order_cnt;
-  accelerator_->OutputPicture(pic);
+  accelerator_->OutputPicture(pic, visible_rect_);
 }
 
 void H264Decoder::ClearDPB() {
@@ -1093,6 +1093,12 @@ bool H264Decoder::ProcessSPS(int sps_id, bool* need_new_buffers) {
     return false;
   }
 
+  gfx::Rect new_visible_rect = sps->GetVisibleRect().value_or(gfx::Rect());
+  if (visible_rect_ != new_visible_rect) {
+    DVLOG(1) << "New visible rect: " << new_visible_rect.ToString();
+    visible_rect_ = new_visible_rect;
+  }
+
   int width_mb = new_pic_size.width() / 16;
   int height_mb = new_pic_size.height() / 16;