VaapiVideoAccelerator: make Vaapi accelerator work with ozone

ui/ozone/platform/dri/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/dri/gbm_buffer.h"
 
 #include <drm.h>
 #include <fcntl.h>
 #include <gbm.h>
 #include <xf86drm.h>
@@ skipping 51 matching lines @@
     return NULL;
 
   return buffer;
 }
 
 GbmPixmap::GbmPixmap(scoped_refptr<GbmBuffer> buffer)
     : buffer_(buffer), dma_buf_(-1) {
 }
 
 bool GbmPixmap::Initialize(DriWrapper* dri) {
-  if (drmPrimeHandleToFD(dri->get_fd(), buffer_->GetHandle(), DRM_CLOEXEC,
-                         &dma_buf_)) {
+  // We want to use the GBM API because it's going to call into libdrm
+  // which might do some optimizations on buffer allocation,
+  // especially when sharing buffers via DMABUF.
+  dma_buf_ = gbm_bo_get_fd(buffer_->bo());
+  if (dma_buf_ < 0) {
     LOG(ERROR) << "Failed to export buffer to dma_buf";
     return false;
   }
-
   return true;
 }
 
 GbmPixmap::~GbmPixmap() {
   if (dma_buf_ > 0)
     close(dma_buf_);
 }
 
 void* GbmPixmap::GetEGLClientBuffer() {
   // TODO(achaulk): change back to null when dma_buf bug is fixed.
   return buffer_->bo();
 }
 
 int GbmPixmap::GetDmaBufFd() {
   return dma_buf_;
 }
 
 int GbmPixmap::GetDmaBufPitch() {
   return gbm_bo_get_stride(buffer_->bo());
 }
 
 }  // namespace ui