Show corresponding window/widget/view in UIElement tree when clicking on a UI element.

components/ui_devtools/views/ui_devtools_unittest.cc

Index: components/ui_devtools/views/ui_devtools_unittest.cc
diff --git a/components/ui_devtools/views/ui_devtools_unittest.cc b/components/ui_devtools/views/ui_devtools_unittest.cc
index e0fed67df941d48a08f69d02b7517447340a4ee5..67bae2cf6d7c8d043cc753b80699aa1afdabdbba 100644
--- a/components/ui_devtools/views/ui_devtools_unittest.cc
+++ b/components/ui_devtools/views/ui_devtools_unittest.cc
@@ -222,7 +222,7 @@ class UIDevToolsTest : public views::ViewsTestBase {
     fake_frontend_channel_ = base::MakeUnique<FakeFrontendChannel>();
     uber_dispatcher_ =
         base::MakeUnique<UberDispatcher>(fake_frontend_channel_.get());
-    dom_agent_ = base::MakeUnique<ui_devtools::UIDevToolsDOMAgent>();
+    dom_agent_ = base::MakeUnique<ui_devtools::UIDevToolsDOMAgent>(nullptr);
     dom_agent_->Init(uber_dispatcher_.get());
     css_agent_ =
         base::MakeUnique<ui_devtools::UIDevToolsCSSAgent>(dom_agent_.get());