cros: Bind hangup red button on remote controller to close web dialog

ui/views/test/widget_test.cc

 // Copyright 2013 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/test/widget_test.h"
 
 #include "build/build_config.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/views/test/native_widget_factory.h"
 #include "ui/views/widget/root_view.h"
@@ skipping 160 matching lines @@
   if (active_ != active)
     return;
 
   observed_ = true;
   widget->RemoveObserver(this);
   if (run_loop_.running())
     run_loop_.Quit();
 }
 
 WidgetClosingObserver::WidgetClosingObserver(Widget* widget) : widget_(widget) {
+  if (!widget)
+    return;

[xiyuan, 2017/05/12 22:29:57]

DCHECK(widget) or just get rid of it to let it crash.

[Qiang(Joe) Xu, 2017/05/12 22:39:33]

done by removing

   widget_->AddObserver(this);
 }
 
 WidgetClosingObserver::~WidgetClosingObserver() {
   if (widget_)
     widget_->RemoveObserver(this);
 }
 
+void WidgetClosingObserver::Wait() {
+  if (widget_)
+    run_loop_.Run();
+}
+
 void WidgetClosingObserver::OnWidgetClosing(Widget* widget) {
   DCHECK_EQ(widget_, widget);
   widget_->RemoveObserver(this);
   widget_ = nullptr;
+  if (run_loop_.running())
+    run_loop_.Quit();
 }
 
 }  // namespace test
 }  // namespace views