Implement DRM Native Pixmap using prime buffer

ui/ozone/platform/headless/ozone_platform_headless.cc

 // Copyright 2013 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/headless/ozone_platform_headless.h"
 
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/macros.h"
 #include "ui/base/cursor/ozone/bitmap_cursor_factory_ozone.h"
@@ skipping 60 matching lines @@
   }
   scoped_ptr<PlatformWindow> CreatePlatformWindow(
       PlatformWindowDelegate* delegate,
       const gfx::Rect& bounds) override {
     return make_scoped_ptr<PlatformWindow>(
         new HeadlessWindow(delegate, window_manager_.get(), bounds));
   }
   scoped_ptr<NativeDisplayDelegate> CreateNativeDisplayDelegate() override {
     return make_scoped_ptr(new NativeDisplayDelegateOzone());
   }
-  base::ScopedFD OpenClientNativePixmapDevice() const override {
-    return base::ScopedFD();
-  }
 
   void InitializeUI() override {
     window_manager_.reset(new HeadlessWindowManager(file_path_));
     window_manager_->Initialize();
     surface_factory_.reset(new HeadlessSurfaceFactory(window_manager_.get()));
     // This unbreaks tests that create their own.
     if (!PlatformEventSource::GetInstance())
       platform_event_source_.reset(new HeadlessPlatformEventSource);
     KeyboardLayoutEngineManager::SetKeyboardLayoutEngine(
         make_scoped_ptr(new StubKeyboardLayoutEngine()));
@@ skipping 28 matching lines @@
 
 OzonePlatform* CreateOzonePlatformHeadless() {
   base::CommandLine* cmd = base::CommandLine::ForCurrentProcess();
   base::FilePath location;
   if (cmd->HasSwitch(switches::kOzoneDumpFile))
     location = cmd->GetSwitchValuePath(switches::kOzoneDumpFile);
   return new OzonePlatformHeadless(location);
 }
 
 }  // namespace ui