If a delay is added to WidgetInputMethodInteractiveTest.Activation, the test will crash with the following stack:
[FATAL:focus_ring.cc(85)] Check failed: IsPathUseable(path). 
    base::debug::StackTrace::StackTrace(...
    logging::LogMessage::~LogMessage(... 
    views::FocusRing::OnPaint(...
    views::View::Paint(...
    views::View::OnPaintLayer(...
    ui::Layer::PaintContentsToDisplayList(...
    non-virtual thunk to ui::Layer::PaintContentsToDisplayList(...
    cc::PictureLayer::Update(... 
    cc::LayerTreeHost::PaintContent(...
    cc::LayerTreeHost::DoUpdateLayers(...
    cc::LayerTreeHost::UpdateLayers(... 
    cc::SingleThreadProxy::BeginMainFrame(...

This crash was triggered by adding a delay to ensure smooth resizing, but it can be triggered independently of that change.

The following patch will trigger the crash:
diff --git a/ui/views/test/widget_test.cc b/ui/views/test/widget_test.cc
index 28977d94d80d..82e21d72a69e 100644
--- a/ui/views/test/widget_test.cc
+++ b/ui/views/test/widget_test.cc
@@ -177,8 +177,10 @@ void WidgetActivationWaiter::OnWidgetActivationChanged(Widget* widget,
 
   observed_ = true;
   widget->RemoveObserver(this);
+/*
   if (run_loop_.running())
     run_loop_.Quit();
+*/
 }
 
 WidgetClosingObserver::WidgetClosingObserver(Widget* widget) : widget_(widget) {