Fix regression where the active window header was not used for apps on CrOS

ui/views/widget/widget.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/views/widget/widget.h"
 
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 982 matching lines @@
 
 void Widget::OnNativeWidgetActivationChanged(bool active) {
   // On windows we may end up here before we've completed initialization (from
   // an WM_NCACTIVATE). If that happens the WidgetDelegate likely doesn't know
   // the Widget and will crash attempting to access it.
   if (!active && native_widget_initialized_)
     SaveWindowPlacement();
 
   FOR_EACH_OBSERVER(WidgetObserver, observers_,
                     OnWidgetActivationChanged(this, active));
+
+  if (IsVisible() && non_client_view())
+    non_client_view()->frame_view()->SchedulePaint();
 }
 
 void Widget::OnNativeFocus(gfx::NativeView old_focused_view) {
   WidgetFocusManager::GetInstance()->OnWidgetFocusEvent(old_focused_view,
                                                         GetNativeView());
 }
 
 void Widget::OnNativeBlur(gfx::NativeView new_focused_view) {
   WidgetFocusManager::GetInstance()->OnWidgetFocusEvent(GetNativeView(),
                                                         new_focused_view);
@@ skipping 408 matching lines @@
 
 ////////////////////////////////////////////////////////////////////////////////
 // internal::NativeWidgetPrivate, NativeWidget implementation:
 
 internal::NativeWidgetPrivate* NativeWidgetPrivate::AsNativeWidgetPrivate() {
   return this;
 }
 
 }  // namespace internal
 }  // namespace views