Add NativePixmapHandle type & interface for exporting them

ui/ozone/public/client_native_pixmap_factory.h

 // 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.
 
 #ifndef UI_OZONE_PUBLIC_CLIENT_NATIVE_PIXMAP_FACTORY_H_
 #define UI_OZONE_PUBLIC_CLIENT_NATIVE_PIXMAP_FACTORY_H_
 
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
 #include "ui/gfx/buffer_types.h"
-#include "ui/gfx/geometry/size.h"
 #include "ui/ozone/ozone_export.h"
 #include "ui/ozone/public/client_native_pixmap.h"
 
+namespace gfx {
+struct NativePixmapHandle;
+class Size;
+}
+
 namespace base {
 
 struct FileDescriptor;
 
 }  // namespace base
 
 namespace ui {
 
 // The Ozone interface allows external implementations to hook into Chromium to
 // provide a client pixmap for non-GPU processes.
 class OZONE_EXPORT ClientNativePixmapFactory {
  public:
   static ClientNativePixmapFactory* GetInstance();
   static void SetInstance(ClientNativePixmapFactory* instance);
 
   static scoped_ptr<ClientNativePixmapFactory> Create();
 
   virtual ~ClientNativePixmapFactory();
 
   struct Configuration {
     gfx::BufferFormat format;
     gfx::BufferUsage usage;
   };
 
   // Gets supported format/usage configurations.
   virtual std::vector<Configuration> GetSupportedConfigurations() const = 0;
 
   // TODO(dshwang): implement it. crbug.com/475633
   // Import the native pixmap from |handle| to be used in non-GPU processes.
-  virtual scoped_ptr<ClientNativePixmap> ImportNativePixmap(
-      const base::FileDescriptor& handle,
+  // This function takes ownership of any file descriptors in |handle|.
+  virtual scoped_ptr<ClientNativePixmap> ImportFromHandle(
+      const gfx::NativePixmapHandle& handle,
       const gfx::Size& size,
       gfx::BufferFormat format,
       gfx::BufferUsage usage) = 0;
 
  protected:
   ClientNativePixmapFactory();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ClientNativePixmapFactory);
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_PUBLIC_CLIENT_NATIVE_PIXMAP_FACTORY_H_