Add a cache counter for iOS.

ios/chrome/browser/BUILD.gn

 # Copyright 2015 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("//ios/web/js_compile.gni")
 import("//third_party/protobuf/proto_library.gni")
 
 declare_args() {
   google_test_gaia_client_id = ""
@@ skipping 77 matching lines @@
     "browser_state/off_the_record_chrome_browser_state_impl.h",
     "browser_state/off_the_record_chrome_browser_state_io_data.h",
     "browser_state/off_the_record_chrome_browser_state_io_data.mm",
     "browser_state_metrics/browser_state_metrics.cc",
     "browser_state_metrics/browser_state_metrics.h",
     "browsing_data/browsing_data_change_listening.h",
     "browsing_data/browsing_data_counter_wrapper.cc",
     "browsing_data/browsing_data_counter_wrapper.h",
     "browsing_data/browsing_data_remover_helper.cc",
     "browsing_data/browsing_data_remover_helper.h",
+    "browsing_data/cache_counter.cc",
+    "browsing_data/cache_counter.h",
     "browsing_data/ios_browsing_data_counter_factory.cc",
     "browsing_data/ios_browsing_data_counter_factory.h",
     "browsing_data/ios_chrome_browsing_data_remover.h",
     "browsing_data/ios_chrome_browsing_data_remover.mm",
     "chrome_constants.cc",
     "chrome_constants.h",
     "chrome_coordinator.h",
     "chrome_coordinator.mm",
     "chrome_paths.h",
     "chrome_paths.mm",
@@ skipping 747 matching lines @@
     "//ios/public/provider/chrome/browser",
     "//ios/public/provider/chrome/browser:test_support",
     "//ios/web",
     "//net:test_support",
     "//testing/gmock",
     "//testing/gtest",
     "//ui/base",
     "//url",
   ]
 }