Add a cache counter for iOS.

ios/chrome/browser/browsing_data/ios_browsing_data_counter_factory.cc

 // 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.
 
 #include "ios/chrome/browser/browsing_data/ios_browsing_data_counter_factory.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/memory/ptr_util.h"
 #include "components/browser_sync/profile_sync_service.h"
 #include "components/browsing_data/core/counters/autofill_counter.h"
 #include "components/browsing_data/core/counters/browsing_data_counter.h"
 #include "components/browsing_data/core/counters/history_counter.h"
 #include "components/browsing_data/core/counters/passwords_counter.h"
 #include "components/browsing_data/core/pref_names.h"
 #include "components/keyed_service/core/service_access_type.h"
 #include "ios/chrome/browser/browser_state/chrome_browser_state.h"
+#include "ios/chrome/browser/browsing_data/cache_counter.h"
 #include "ios/chrome/browser/experimental_flags.h"
 #include "ios/chrome/browser/history/history_service_factory.h"
 #include "ios/chrome/browser/history/web_history_service_factory.h"
 #include "ios/chrome/browser/passwords/ios_chrome_password_store_factory.h"
 #include "ios/chrome/browser/sync/ios_chrome_profile_sync_service_factory.h"
 #include "ios/chrome/browser/web_data_service_factory.h"
 
 // static
 std::unique_ptr<browsing_data::BrowsingDataCounter>
 IOSBrowsingDataCounterFactory::GetForBrowserStateAndPref(
     ios::ChromeBrowserState* browser_state,
     base::StringPiece pref_name) {
   if (!experimental_flags::IsNewClearBrowsingDataUIEnabled())
     return nullptr;
 
   if (pref_name == browsing_data::prefs::kDeleteBrowsingHistory) {
     return base::MakeUnique<browsing_data::HistoryCounter>(
         ios::HistoryServiceFactory::GetForBrowserStateIfExists(
             browser_state, ServiceAccessType::EXPLICIT_ACCESS),
         base::Bind(&ios::WebHistoryServiceFactory::GetForBrowserState,
                    base::Unretained(browser_state)),
         IOSChromeProfileSyncServiceFactory::GetForBrowserState(browser_state));
   }
 
+  if (pref_name == browsing_data::prefs::kDeleteCache)
+    return base::MakeUnique<CacheCounter>(browser_state);
+
   if (pref_name == browsing_data::prefs::kDeletePasswords) {
     return base::MakeUnique<browsing_data::PasswordsCounter>(
         IOSChromePasswordStoreFactory::GetForBrowserState(
             browser_state, ServiceAccessType::EXPLICIT_ACCESS));
   }
 
   if (pref_name == browsing_data::prefs::kDeleteFormData) {
     return base::MakeUnique<browsing_data::AutofillCounter>(
         ios::WebDataServiceFactory::GetAutofillWebDataForBrowserState(
             browser_state, ServiceAccessType::EXPLICIT_ACCESS));
   }
 
   return nullptr;
 }