Add NativePixmapHandle type & interface for exporting them

content/common/gpu/client/gpu_memory_buffer_impl_ozone_native_pixmap.h

Index: content/common/gpu/client/gpu_memory_buffer_impl_ozone_native_pixmap.h
diff --git a/content/common/gpu/client/gpu_memory_buffer_impl_ozone_native_pixmap.h b/content/common/gpu/client/gpu_memory_buffer_impl_ozone_native_pixmap.h
index f72f344e5f74c51bf4b5392a72019ceb78081d93..f87f32b783491cf855dd1153839abbf54fbf099a 100644
--- a/content/common/gpu/client/gpu_memory_buffer_impl_ozone_native_pixmap.h
+++ b/content/common/gpu/client/gpu_memory_buffer_impl_ozone_native_pixmap.h
@@ -7,6 +7,10 @@
 
 #include "content/common/gpu/client/gpu_memory_buffer_impl.h"
 
+namespace ui {
+class ClientNativePixmap;
+}
+
 namespace content {
 
 // Implementation of GPU memory buffer based on Ozone native pixmap.
@@ -26,12 +30,16 @@ class GpuMemoryBufferImplOzoneNativePixmap : public GpuMemoryBufferImpl {
   gfx::GpuMemoryBufferHandle GetHandle() const override;
 
  private:
-  GpuMemoryBufferImplOzoneNativePixmap(gfx::GpuMemoryBufferId id,
-                                       const gfx::Size& size,
-                                       gfx::BufferFormat format,
-                                       const DestructionCallback& callback);
+  GpuMemoryBufferImplOzoneNativePixmap(
+      gfx::GpuMemoryBufferId id,
+      const gfx::Size& size,
+      gfx::BufferFormat format,
+      const DestructionCallback& callback,
+      scoped_ptr<ui::ClientNativePixmap> native_pixmap);
   ~GpuMemoryBufferImplOzoneNativePixmap() override;
 
+  scoped_ptr<ui::ClientNativePixmap> pixmap_;
+
   DISALLOW_COPY_AND_ASSIGN(GpuMemoryBufferImplOzoneNativePixmap);
 };