Plumb decoded video pixel format from GPU process to renderer.

media/gpu/vt_video_decode_accelerator_mac.cc

Index: media/gpu/vt_video_decode_accelerator_mac.cc
diff --git a/media/gpu/vt_video_decode_accelerator_mac.cc b/media/gpu/vt_video_decode_accelerator_mac.cc
index dd1a1a05e6f527f7c06c423868756c8a5bdf6e46..1c9fcdd1cde8c84096c92511c8b5bf0fa9b86705 100644
--- a/media/gpu/vt_video_decode_accelerator_mac.cc
+++ b/media/gpu/vt_video_decode_accelerator_mac.cc
@@ -1007,8 +1007,8 @@ bool VTVideoDecodeAccelerator::ProcessFrame(const Frame& frame) {
 
       // Request new pictures.
       picture_size_ = frame.coded_size;
-      client_->ProvidePictureBuffers(kNumPictureBuffers, 1, coded_size_,
-                                     GL_TEXTURE_RECTANGLE_ARB);
+      client_->ProvidePictureBuffers(kNumPictureBuffers, PIXEL_FORMAT_UNKNOWN,
+                                     1, coded_size_, GL_TEXTURE_RECTANGLE_ARB);
       return false;
     }
     if (!SendFrame(frame))