Center wide new-style Views JavaScript dialogs.

chrome/browser/ui/views/javascript_app_modal_dialog_views.cc

Index: chrome/browser/ui/views/javascript_app_modal_dialog_views.cc
diff --git a/chrome/browser/ui/views/javascript_app_modal_dialog_views.cc b/chrome/browser/ui/views/javascript_app_modal_dialog_views.cc
index 57d17a50cec2e3d4674c6a32241f37e44b5197f0..8b4a02e2578badda88a8d25824ce0727b4ab1fc4 100644
--- a/chrome/browser/ui/views/javascript_app_modal_dialog_views.cc
+++ b/chrome/browser/ui/views/javascript_app_modal_dialog_views.cc
@@ -171,6 +171,16 @@ NativeAppModalDialog* NativeAppModalDialog::CreateNativeJavaScriptPrompt(
     JavaScriptAppModalDialog* dialog,
     gfx::NativeWindow parent_window) {
   JavaScriptAppModalDialogViews* d = new JavaScriptAppModalDialogViews(dialog);
-  views::DialogDelegate::CreateDialogWidget(d, NULL, parent_window);
+  views::Widget* widget =
+      views::DialogDelegate::CreateDialogWidget(d, NULL, parent_window);
+  views::Widget* parent_widget = parent_window ?
+      views::Widget::GetWidgetForNativeWindow(parent_window) : NULL;
+  // Horizontally center the dialog window within the parent window's bounds.
+  if (widget && parent_widget) {
+    gfx::Rect bounds(widget->GetWindowBoundsInScreen());
+    gfx::Rect parent_bounds(parent_widget->GetWindowBoundsInScreen());
+    bounds.set_x(parent_bounds.CenterPoint().x() - bounds.width() / 2);
+    widget->SetBounds(bounds);
+  }
   return d;
 }