[NotForReview] Enable YUV video overlay on Skylake ChromeOS.

ui/ozone/platform/drm/gpu/gbm_buffer.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/ozone/platform/drm/gpu/gbm_buffer.h"
 
 #include <drm.h>
 #include <fcntl.h>
 #include <gbm.h>
 #include <xf86drm.h>
@@ skipping 262 matching lines @@
       OverlayPlane(buffer_, plane_z_order, plane_transform, display_bounds,
                    crop_rect, processing_callback));
 
   return true;
 }
 
 scoped_refptr<ScanoutBuffer> GbmPixmap::ProcessBuffer(const gfx::Size& size,
                                                       uint32_t format) {
   DCHECK(GetBufferSize() != size ||
          buffer_->GetFramebufferPixelFormat() != format);
+  PLOG(ERROR) << "GbmPixmap::ProcessBuffer " << format;
 
   if (!processed_pixmap_ || size != processed_pixmap_->GetBufferSize() ||
       format != processed_pixmap_->buffer()->GetFramebufferPixelFormat()) {
     // Release any old processed pixmap.
     processed_pixmap_ = nullptr;
     scoped_refptr<GbmBuffer> buffer = GbmBuffer::CreateBuffer(
         buffer_->drm().get(), format, size, buffer_->GetFlags());
     if (!buffer)
       return nullptr;
 
     // ProcessBuffer is called on DrmThread. We could have used
     // CreateNativePixmap to initialize the pixmap, however it posts a
     // synchronous task to DrmThread resulting in a deadlock.
     processed_pixmap_ = new GbmPixmap(surface_manager_, buffer);
   }
 
   DCHECK(!processing_callback_.is_null());
   if (!processing_callback_.Run(this, processed_pixmap_)) {
     LOG(ERROR) << "Failed processing NativePixmap";
     return nullptr;
   }
 
   return processed_pixmap_->buffer();
 }
 
 }  // namespace ui