Center Keyboard Overlay in the work area

ash/content/keyboard_overlay/keyboard_overlay_delegate.cc

Index: ash/content/keyboard_overlay/keyboard_overlay_delegate.cc
diff --git a/ash/content/keyboard_overlay/keyboard_overlay_delegate.cc b/ash/content/keyboard_overlay/keyboard_overlay_delegate.cc
index ec661d80fdea682447c0e7fdc172e017a97e7873..14af0f50d626e3e2eb882f15b871c666006edac7 100644
--- a/ash/content/keyboard_overlay/keyboard_overlay_delegate.cc
+++ b/ash/content/keyboard_overlay/keyboard_overlay_delegate.cc
@@ -83,7 +83,8 @@ views::Widget* KeyboardOverlayDelegate::Show(views::WebDialogView* view) {
           ->GetDisplayNearestWindow(widget_->GetNativeView())
           .work_area();
   gfx::Rect bounds(rect.x() + (rect.width() - size.width()) / 2,
-                   rect.bottom() - size.height(), size.width(), size.height());
+                   rect.y() + (rect.height() - size.height()) / 2, size.width(),
+                   size.height());
   widget_->SetBounds(bounds);
 
   // The widget will be shown when the web contents gets ready to display.