Add NativePixmapHandle type & interface for exporting them

ui/ozone/common/stub_client_native_pixmap_factory.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/common/stub_client_native_pixmap_factory.h"
 
 #include "base/file_descriptor_posix.h"
+#include "ui/gfx/native_pixmap_handle_ozone.h"
 
 namespace ui {
 
 namespace {
 
 class StubClientNativePixmapFactory : public ClientNativePixmapFactory {
  public:
   StubClientNativePixmapFactory() {}
   ~StubClientNativePixmapFactory() override {}
 
   // ClientNativePixmapFactory:
   std::vector<Configuration> GetSupportedConfigurations() const override {
     return std::vector<Configuration>();
   }
-  scoped_ptr<ClientNativePixmap> ImportNativePixmap(
-      const base::FileDescriptor& handle,
+  scoped_ptr<ClientNativePixmap> ImportFromHandle(
+      const gfx::NativePixmapHandle& handle,
       const gfx::Size& size,
       gfx::BufferFormat format,
       gfx::BufferUsage usage) override {
-    NOTIMPLEMENTED();
+    NOTREACHED();
     return nullptr;
   }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(StubClientNativePixmapFactory);
 };
 
 }  // namespace
 
 ClientNativePixmapFactory* CreateStubClientNativePixmapFactory() {
   return new StubClientNativePixmapFactory;
 }
 
 }  // namespace ui