DevTools: add console test helpers to new test runner & migrate a console test

third_party/WebKit/Source/devtools/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/features.gni")
 import("//third_party/WebKit/public/public_features.gni")
 import("//third_party/WebKit/Source/core/core.gni")
 
 all_devtools_files = [
   "front_end/accessibility/AccessibilityModel.js",
@@ skipping 134 matching lines @@
   "front_end/console/ConsoleView.js",
   "front_end/console/ConsoleViewMessage.js",
   "front_end/console/ConsoleViewport.js",
   "front_end/console/module.json",
   "front_end/console_model/ConsoleModel.js",
   "front_end/console_model/module.json",
   "front_end/console_test_runner/ConsoleTestRunner.js",
   "front_end/console_test_runner/module.json",
   "front_end/cookie_table/CookiesTable.js",
   "front_end/cookie_table/module.json",
+  "front_end/counters/errorWarningCounter.css",
+  "front_end/counters/module.json",
+  "front_end/counters/WarningErrorCounter.js",
   "front_end/coverage/coverageListView.css",
   "front_end/coverage/CoverageDecorationManager.js",
   "front_end/coverage/CoverageListView.js",
   "front_end/coverage/CoverageModel.js",
   "front_end/coverage/coverageView.css",
   "front_end/coverage/CoverageView.js",
   "front_end/coverage/module.json",
   "front_end/data_grid/dataGrid.css",
   "front_end/data_grid/DataGrid.js",
   "front_end/data_grid/module.json",
@@ skipping 136 matching lines @@
   "front_end/layer_viewer/LayerTreeOutline.js",
   "front_end/layer_viewer/LayerViewHost.js",
   "front_end/layer_viewer/module.json",
   "front_end/layer_viewer/paintProfiler.css",
   "front_end/layer_viewer/PaintProfilerView.js",
   "front_end/layer_viewer/TransformController.js",
   "front_end/layers/LayerPaintProfilerView.js",
   "front_end/layers/LayersPanel.js",
   "front_end/layers/LayerTreeModel.js",
   "front_end/layers/module.json",
-  "front_end/main/errorWarningCounter.css",
   "front_end/main/ExecutionContextSelector.js",
   "front_end/main/GCActionDelegate.js",
   "front_end/main/Main.js",
   "front_end/main/module.json",
   "front_end/main/nodeIcon.css",
   "front_end/main/remoteDebuggingTerminatedScreen.css",
   "front_end/main/renderingOptions.css",
   "front_end/main/RenderingOptions.js",
   "front_end/main/RequestAppBannerActionDelegate.js",
   "front_end/main/SimpleApp.js",
@@ skipping 859 matching lines @@
     ".eslintrc.js",
     "devtools-node-modules/",
     "front_end/",
     "scripts/buildbot/run_eslint.py",
     "scripts/local_node/",
     "//testing/scripts/common.py",
     "//testing/scripts/run_devtools_check.py",
     "//testing/xvfb.py",
   ]
 }