Implement DRM Native Pixmap using prime buffer

ui/ozone/platform/drm/ozone_platform_gbm.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/ozone_platform_gbm.h"
 
 #include <dlfcn.h>
 #include <fcntl.h>
 #include <gbm.h>
 #include <stdlib.h>
@@ skipping 103 matching lines @@
         delegate, bounds, gpu_platform_support_host_.get(),
         event_factory_ozone_.get(), cursor_.get(), window_manager_.get(),
         display_manager_.get(), overlay_manager_.get()));
     platform_window->Initialize();
     return std::move(platform_window);
   }
   scoped_ptr<NativeDisplayDelegate> CreateNativeDisplayDelegate() override {
     return make_scoped_ptr(
         new DrmNativeDisplayDelegate(display_manager_.get()));
   }
-  base::ScopedFD OpenClientNativePixmapDevice() const override {
-#if defined(USE_VGEM_MAP)
-    int vgem_fd = drmOpenWithType("vgem", nullptr, DRM_NODE_RENDER);
-    if (vgem_fd < 0) {
-      PLOG(ERROR) << "Failed to find vgem device";
-      vgem_fd = -1;
-    }
-    return base::ScopedFD(vgem_fd);
-#endif
-    return base::ScopedFD();
-  }
   void InitializeUI() override {
     device_manager_ = CreateDeviceManager();
     window_manager_.reset(new DrmWindowHostManager());
     cursor_.reset(new DrmCursor(window_manager_.get()));
 #if defined(USE_XKBCOMMON)
     KeyboardLayoutEngineManager::SetKeyboardLayoutEngine(make_scoped_ptr(
         new XkbKeyboardLayoutEngine(xkb_evdev_code_converter_)));
 #else
     KeyboardLayoutEngineManager::SetKeyboardLayoutEngine(
         make_scoped_ptr(new StubKeyboardLayoutEngine()));
@@ skipping 72 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(OzonePlatformGbm);
 };
 
 }  // namespace
 
 OzonePlatform* CreateOzonePlatformGbm() {
   return new OzonePlatformGbm;
 }
 
 }  // namespace ui