Don't reset the codec state for a flush; this kills the frames.

media/gpu/avda_codec_image.cc

Index: media/gpu/avda_codec_image.cc
diff --git a/media/gpu/avda_codec_image.cc b/media/gpu/avda_codec_image.cc
index 4fd16c21665473fd6a55a74383ea61b42e8ce500..07213f3a14b0edca57980cab6c58e940bdcde35a 100644
--- a/media/gpu/avda_codec_image.cc
+++ b/media/gpu/avda_codec_image.cc
@@ -35,7 +35,7 @@ AVDACodecImage::AVDACodecImage(
   // Default to a sane guess of "flip Y", just in case we can't get
   // the matrix on the first call.
   memset(gl_matrix_, 0, sizeof(gl_matrix_));
-  gl_matrix_[0] = gl_matrix_[10] = gl_matrix_[15] = 1.0f;
+  gl_matrix_[0] = gl_matrix_[10] = gl_matrix_[13] = gl_matrix_[15] = 1.0f;
   gl_matrix_[5] = -1.0f;
   shared_state_->SetImageForPicture(picture_buffer_id_, this);
 }