ozone: ClientPixmapManager passes VGEM fd from browser to renderer.

ui/ozone/platform/drm/common/native_pixmap_manager_gbm.cc

 // Copyright 2015 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/common/native_pixmap_manager_gbm.h"
 
+#include "base/file_descriptor_posix.h"
+#include "base/files/scoped_file.h"
 #include "ui/ozone/public/native_pixmap_manager.h"
 
 namespace ui {
 
 namespace {
 
 class NativePixmapManagerGbm : public NativePixmapManager {
  public:
   NativePixmapManagerGbm() {}
   ~NativePixmapManagerGbm() override {}
 
   // NativePixmapManager:
+  void Initialize(const base::FileDescriptor& device_fd) override {
+    DCHECK_EQ(vgem_fd_.get(), -1);
+    if (device_fd.fd > 0)
+      vgem_fd_.reset(device_fd.fd);
+  }
   std::vector<Configuration> GetSupportedNativePixmapConfigurations()
       const override {
     std::vector<Configuration> configurations = {
         {SurfaceFactoryOzone::BGRA_8888, SurfaceFactoryOzone::SCANOUT},
         {SurfaceFactoryOzone::RGBX_8888, SurfaceFactoryOzone::SCANOUT}};
     return configurations;
   }
 
  private:
+  base::ScopedFD vgem_fd_;
+
   DISALLOW_COPY_AND_ASSIGN(NativePixmapManagerGbm);
 };
 
 }  // namespace
 
 NativePixmapManager* CreateNativePixmapManagerGbm() {
   return new NativePixmapManagerGbm();
 }
 
 }  // namespace ui