Allow the Views Delegate to provide the native widget.

ui/views/views_delegate.h

Index: ui/views/views_delegate.h
===================================================================
--- ui/views/views_delegate.h	(revision 156649)
+++ ui/views/views_delegate.h	(working copy)
@@ -14,6 +14,7 @@
 #include "base/string16.h"
 #include "ui/base/accessibility/accessibility_types.h"
 #include "ui/base/ui_base_types.h"
+#include "ui/gfx/native_widget_types.h"
 #include "ui/views/views_export.h"
 
 namespace content {
@@ -28,14 +29,17 @@
 
 namespace views {
 
+class NativeWidget;
 class NonClientFrameView;
 class View;
 class Widget;
-
 #if defined(USE_AURA)
 class NativeWidgetAura;
 class NativeWidgetHelperAura;
 #endif
+namespace internal {
+class NativeWidgetDelegate;
+}
 
 // ViewsDelegate is an interface implemented by an object using the views
 // framework. It is used to obtain various high level application utilities
@@ -111,6 +115,12 @@
   virtual content::WebContents* CreateWebContents(
       content::BrowserContext* browser_context,
       content::SiteInstance* site_instance) = 0;
+
+  // Creates a NativeWidget implementation. Returning NULL means Widget will
+  // create a default implementation for the platform.
+  virtual NativeWidget* CreateNativeWidget(
+      internal::NativeWidgetDelegate* delegate,
+      gfx::NativeView parent) = 0;
 };
 
 }  // namespace views