Implement DRM Native Pixmap using prime buffer

ui/ozone/platform/x11/ozone_platform_x11.cc

 // Copyright 2016 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/x11/ozone_platform_x11.h"
 
 #include <utility>
 
 #include "base/memory/scoped_ptr.h"
 #include "ui/events/platform/x11/x11_event_source_libevent.h"
@@ skipping 55 matching lines @@
         make_scoped_ptr(new X11WindowOzone(event_source_.get(), delegate));
     window->SetBounds(bounds);
     window->Create();
     return std::move(window);
   }
 
   scoped_ptr<NativeDisplayDelegate> CreateNativeDisplayDelegate() override {
     return make_scoped_ptr(new NativeDisplayDelegateOzone());
   }
 
-  base::ScopedFD OpenClientNativePixmapDevice() const override {
-    return base::ScopedFD();
-  }
-
   void InitializeUI() override {
     event_source_.reset(new X11EventSourceLibevent(gfx::GetXDisplay()));
     surface_factory_ozone_.reset(new X11SurfaceFactory());
     overlay_manager_.reset(new StubOverlayManager());
     input_controller_ = CreateStubInputController();
     cursor_factory_ozone_.reset(new X11CursorFactoryOzone());
     gpu_platform_support_host_.reset(CreateStubGpuPlatformSupportHost());
   }
 
   void InitializeGPU() override {
@@ skipping 18 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(OzonePlatformX11);
 };
 
 }  // namespace
 
 OzonePlatform* CreateOzonePlatformX11() {
   return new OzonePlatformX11;
 }
 
 }  // namespace ui