DialogBrowserTest implementation to invoke Content settings bubble dialogs.

ui/views/test/widget_test_aura.cc

Index: ui/views/test/widget_test_aura.cc
diff --git a/ui/views/test/widget_test_aura.cc b/ui/views/test/widget_test_aura.cc
index 8cabaf5cf256a5634350549cb3f7e8ccdf606520..53af04557b2b0743e37927e8208e277471f65074 100644
--- a/ui/views/test/widget_test_aura.cc
+++ b/ui/views/test/widget_test_aura.cc
@@ -163,10 +163,10 @@ bool WidgetTest::IsNativeWindowTransparent(gfx::NativeWindow window) {
 
 // static
 Widget::Widgets WidgetTest::GetAllWidgets() {
-  std::vector<aura::Window*> toplevel = GetAllTopLeveLWindows();
+  std::vector<aura::Window*> toplevels = GetAllTopLeveLWindows();
   Widget::Widgets all_widgets;
-  for (aura::Window* root : toplevel)
-    Widget::GetAllChildWidgets(root, &all_widgets);
+  for (aura::Window* window : toplevels)
+    Widget::GetAllChildWidgets(window->GetRootWindow(), &all_widgets);

[tapted, 2017/02/03 23:07:03]

This shouldn't be landed with this CL -- it needs to be landed with an update to
widget_test_unittest.cc as well (or we need to investigate why windows are being
parented to the WindowTreeHost's "root" window rather than the "content" window)

[tapted, 2017/02/06 09:34:31]

(oops - I missed the "this is temporary" note you had. I've updated
https://codereview.chromium.org/2663163004 with a test, but I didn't have time
today to look into why the parent is unexpected for some dialogs :/)

   return all_widgets;
 }