Add StructTraits for AcceleratedWidget instances.

ui/gfx/mojo/accelerated_widget_struct_traits.h

Index: ui/gfx/mojo/accelerated_widget_struct_traits.h
diff --git a/ui/gfx/mojo/accelerated_widget_struct_traits.h b/ui/gfx/mojo/accelerated_widget_struct_traits.h
new file mode 100644
index 0000000000000000000000000000000000000000..922a07ba6b7d6b39ca04ecbabb077633dba0ddcb
--- /dev/null
+++ b/ui/gfx/mojo/accelerated_widget_struct_traits.h
@@ -0,0 +1,47 @@
+// Copyright 2016 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_GFX_MOJO_ACCELERATED_WIDGET_STRUCT_TRAITS_H_
+#define UI_GFX_MOJO_ACCELERATED_WIDGET_STRUCT_TRAITS_H_
+
+#include "ui/gfx/mojo/accelerated_widget.mojom.h"
+#include "ui/gfx/native_widget_types.h"
+
+namespace mojo {
+
+template <>
+struct StructTraits<gfx::mojom::AcceleratedWidget, gfx::AcceleratedWidget> {
+  static uint64_t widget(const gfx::AcceleratedWidget& widget) {
+#if defined(OS_WIN) || defined(USE_OZONE) || defined(USE_X11)
+#if defined(OS_WIN)
+    return reinterpret_cast<uint64_t>(widget);
+#else
+    return static_cast<uint64_t>(widget);
+#endif
+#else
+    NOTIMPLEMENTED();
+    return 0;
+#endif
+  }
+
+  static bool Read(gfx::mojom::AcceleratedWidgetDataView data,
+                   gfx::AcceleratedWidget* out) {
+#if defined(OS_WIN) || defined(USE_OZONE) || defined(USE_X11)
+    uint64_t w = data.widget();
+#if defined(OS_WIN)
+    *out = reinterpret_cast<gfx::AcceleratedWidget>(w);
+#else
+    *out = static_cast<gfx::AcceleratedWidget>(w);
+#endif
+#else
+    NOTIMPLEMENTED();
+    *out = 0;
+#endif
+    return true;
+  }
+};
+
+}  // namespace mojo
+
+#endif  // UI_GFX_MOJO_ACCELERATED_WIDGET_STRUCT_TRAITS_H_