Allow a Views client to provide a default frameview for window widgets.

ash/shell/shell_main.cc

Index: ash/shell/shell_main.cc
===================================================================
--- ash/shell/shell_main.cc	(revision 117168)
+++ ash/shell/shell_main.cc	(working copy)
@@ -26,6 +26,21 @@
 
 namespace {
 
+class ShellViewsDelegate : public views::TestViewsDelegate {
+ public:
+  ShellViewsDelegate() {}
+  virtual ~ShellViewsDelegate() {}
+
+  // Overridden from views::TestViewsDelegate:
+  virtual views::NonClientFrameView* CreateDefaultNonClientFrameView(
+      views::Widget* widget) OVERRIDE {
+    return ash::Shell::GetInstance()->CreateDefaultNonClientFrameView(widget);
+  }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ShellViewsDelegate);
+};
+
 class ShellDelegateImpl : public ash::ShellDelegate {
  public:
   ShellDelegateImpl() {
@@ -116,7 +131,7 @@
 
   // A ViewsDelegate is required.
   if (!views::ViewsDelegate::views_delegate)
-    views::ViewsDelegate::views_delegate = new views::TestViewsDelegate;
+    views::ViewsDelegate::views_delegate = new ShellViewsDelegate;
 
   ash::Shell::CreateInstance(new ShellDelegateImpl);