Create constrained windows in a hidden state.

views/widget/native_widget_win.cc

Index: views/widget/native_widget_win.cc
diff --git a/views/widget/native_widget_win.cc b/views/widget/native_widget_win.cc
index aa4e8501c3349721252d2adcb2875f46784356e2..badbc31d547755bf6301cabaa9a797e44a31a8f3 100644
--- a/views/widget/native_widget_win.cc
+++ b/views/widget/native_widget_win.cc
@@ -2235,7 +2235,7 @@ void NativeWidgetWin::SetInitParams(const Widget::InitParams& params) {
 
   // Set type-independent style attributes.
   if (params.child)
-    style |= WS_CHILD | WS_VISIBLE;
+    style |= WS_CHILD;
   if (params.show_state == ui::SHOW_STATE_MAXIMIZED)
     style |= WS_MAXIMIZE;
   if (params.show_state == ui::SHOW_STATE_MINIMIZED)
@@ -2278,6 +2278,7 @@ void NativeWidgetWin::SetInitParams(const Widget::InitParams& params) {
       break;
     }
     case Widget::InitParams::TYPE_CONTROL:
+      style |= WS_VISIBLE;
       break;
     case Widget::InitParams::TYPE_WINDOW_FRAMELESS:
       style |= WS_POPUP;