ozone: Introduce ClientPixmap and ClientPixmapFactory for non-GPU processes.

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 <gbm.h>
 #include <stdlib.h>
 
@@ skipping 131 matching lines @@
         new DrmWindowHost(delegate, bounds, gpu_platform_support_host_.get(),
                           event_factory_ozone_.get(), cursor_.get(),
                           window_manager_.get(), display_manager_.get()));
     platform_window->Initialize();
     return platform_window.Pass();
   }
   scoped_ptr<NativeDisplayDelegate> CreateNativeDisplayDelegate() override {
     return make_scoped_ptr(
         new DrmNativeDisplayDelegate(display_manager_.get()));
   }
+  base::FileDescriptor GetVirtualDeviceFd() override {
+    DCHECK(display_manager_);
+    return display_manager_->DupVgemFd();
+  }
+
   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 62 matching lines @@
 OzonePlatform* CreateOzonePlatformGbm() {
   base::CommandLine* cmd = base::CommandLine::ForCurrentProcess();
 #if defined(USE_MESA_PLATFORM_NULL)
   // Only works with surfaceless.
   cmd->AppendSwitch(switches::kOzoneUseSurfaceless);
 #endif
   return new OzonePlatformGbm(cmd->HasSwitch(switches::kOzoneUseSurfaceless));
 }
 
 }  // namespace ui