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

chrome/browser/ui/views/chrome_browser_main_extra_parts_views.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 "chrome/browser/ui/views/chrome_browser_main_extra_parts_views.h"
 
 #include <utility>
 
 #include "base/memory/ptr_util.h"
 #include "chrome/browser/ui/views/chrome_constrained_window_views_client.h"
 #include "chrome/browser/ui/views/chrome_views_delegate.h"
 #include "chrome/browser/ui/views/harmony/chrome_layout_provider.h"
 #include "chrome/browser/ui/views/ime_driver/ime_driver_mus.h"
 #include "components/constrained_window/constrained_window_views.h"
 
 #if defined(USE_AURA)
 #include "base/run_loop.h"
 #include "components/ui_devtools/devtools_server.h"
 #include "components/ui_devtools/views/ui_devtools_css_agent.h"
 #include "components/ui_devtools/views/ui_devtools_dom_agent.h"
+#include "components/ui_devtools/views/ui_devtools_overlay_agent.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/common/service_manager_connection.h"
 #include "services/service_manager/public/cpp/connector.h"
 #include "services/service_manager/runner/common/client_util.h"
 #include "services/ui/public/cpp/gpu/gpu.h"  // nogncheck
 #include "services/ui/public/cpp/input_devices/input_device_client.h"
 #include "services/ui/public/interfaces/constants.mojom.h"
 #include "services/ui/public/interfaces/input_devices/input_device_server.mojom.h"
 #include "ui/display/screen.h"
 #include "ui/views/mus/mus_client.h"
@@ skipping 72 matching lines @@
 void ChromeBrowserMainExtraPartsViews::PreProfileInit() {
 #if defined(USE_AURA)
   // IME driver must be available at login screen, so initialize before profile.
   if (service_manager::ServiceManagerIsRemote())
     IMEDriver::Register();
 
   // Start devtools server
   devtools_server_ = ui_devtools::UiDevToolsServer::Create(nullptr);
   if (devtools_server_) {
     auto dom_backend = base::MakeUnique<ui_devtools::UIDevToolsDOMAgent>();
+    auto overlay_backend =
+        base::MakeUnique<ui_devtools::UIDevToolsOverlayAgent>(
+            dom_backend.get());
     auto css_backend =
         base::MakeUnique<ui_devtools::UIDevToolsCSSAgent>(dom_backend.get());
     auto devtools_client = base::MakeUnique<ui_devtools::UiDevToolsClient>(
         "UiDevToolsClient", devtools_server_.get());
     devtools_client->AddAgent(std::move(dom_backend));
     devtools_client->AddAgent(std::move(css_backend));
+    devtools_client->AddAgent(std::move(overlay_backend));
     devtools_server_->AttachClient(std::move(devtools_client));
   }
 #endif
 
 #if defined(OS_LINUX) && !defined(OS_CHROMEOS)
   // On the Linux desktop, we want to prevent the user from logging in as root,
   // so that we don't destroy the profile. Now that we have some minimal ui
   // initialized, check to see if we're running as root and bail if we are.
   if (geteuid() != 0)
     return;
@@ skipping 44 matching lines @@
 
   // WMState is owned as a member, so don't have MusClient create it.
   const bool create_wm_state = false;
   mus_client_ = base::MakeUnique<views::MusClient>(
       connection->GetConnector(), service_manager::Identity(),
       content::BrowserThread::GetTaskRunnerForThread(
           content::BrowserThread::IO),
       create_wm_state);
 #endif  // defined(USE_AURA)
 }