[ios clean] Toolbar displays total number of tabs.

ios/clean/chrome/browser/ui/toolbar/BUILD.gn

 # Copyright 2016 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.
 
 source_set("toolbar") {
   sources = [
     "toolbar_coordinator.h",
     "toolbar_coordinator.mm",
     "toolbar_mediator.h",
     "toolbar_mediator.mm",
   ]
 
   configs += [ "//build/config/compiler:enable_arc" ]
 
   deps = [
     ":toolbar_ui",
     "//base",
+    "//ios/chrome/browser/web_state_list",
     "//ios/clean/chrome/browser/ui/commands",
     "//ios/clean/chrome/browser/ui/omnibox",
     "//ios/clean/chrome/browser/ui/tools",
     "//ios/shared/chrome/browser/ui/broadcaster",
     "//ios/shared/chrome/browser/ui/browser_list",
     "//ios/shared/chrome/browser/ui/commands",
     "//ios/shared/chrome/browser/ui/coordinators",
     "//ios/shared/chrome/browser/ui/tools_menu",
     "//ios/web",
   ]
 }
 
 source_set("toolbar_ui") {
   sources = [
     "toolbar_consumer.h",
     "toolbar_view_controller.h",
     "toolbar_view_controller.mm",
   ]
   deps = [
     ":toolbar_components_ui",
     "//base",
+    "//ios/chrome/browser/ui",
     "//ios/clean/chrome/browser/ui/actions",
     "//ios/clean/chrome/browser/ui/animators",
     "//ios/clean/chrome/browser/ui/commands",
     "//ios/clean/chrome/browser/ui/tools",
     "//ios/third_party/material_components_ios",
   ]
   libs = [ "UIKit.framework" ]
   configs += [ "//build/config/compiler:enable_arc" ]
 }
 
@@ skipping 20 matching lines @@
   testonly = true
 
   sources = [
     "toolbar_mediator_unittest.mm",
   ]
   deps = [
     ":toolbar",
     ":toolbar_ui",
     "//base",
     "//base/test:test_support",
+    "//ios/chrome/browser/web_state_list",
+    "//ios/chrome/browser/web_state_list:test_support",
     "//ios/shared/chrome/browser/ui/toolbar:test_support",
     "//ios/web",
     "//ios/web:test_support",
     "//testing/gtest",
     "//third_party/ocmock",
   ]
   configs += [ "//build/config/compiler:enable_arc" ]
 }