Add LargeIconCache and LargeIconServiceFactory for iOS.

ios/chrome/browser/favicon/ios_chrome_large_icon_cache_factory.cc

+// 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.
+
+#include "ios/chrome/browser/favicon/ios_chrome_large_icon_cache_factory.h"
+
+#include "base/memory/singleton.h"
+#include "components/keyed_service/ios/browser_state_dependency_manager.h"
+#include "ios/chrome/browser/browser_state/browser_state_otr_helper.h"
+#include "ios/chrome/browser/favicon/large_icon_cache.h"
+#include "ios/public/provider/chrome/browser/browser_state/chrome_browser_state.h"
+
+// static
+LargeIconCache* IOSChromeLargeIconCacheFactory::GetForBrowserState(
+    ios::ChromeBrowserState* browser_state) {
+  return static_cast<LargeIconCache*>(
+      GetInstance()->GetServiceForBrowserState(browser_state, true));
+}
+
+// static
+IOSChromeLargeIconCacheFactory* IOSChromeLargeIconCacheFactory::GetInstance() {
+  return base::Singleton<IOSChromeLargeIconCacheFactory>::get();
+}
+
+IOSChromeLargeIconCacheFactory::IOSChromeLargeIconCacheFactory()
+    : BrowserStateKeyedServiceFactory(
+          "LargeIconCache",
+          BrowserStateDependencyManager::GetInstance()) {}
+
+IOSChromeLargeIconCacheFactory::~IOSChromeLargeIconCacheFactory() {}
+
+scoped_ptr<KeyedService>
+IOSChromeLargeIconCacheFactory::BuildServiceInstanceFor(
+    web::BrowserState* context) const {
+  return make_scoped_ptr(new LargeIconCache);
+}
+
+web::BrowserState* IOSChromeLargeIconCacheFactory::GetBrowserStateToUse(
+    web::BrowserState* context) const {
+  return GetBrowserStateOwnInstanceInIncognito(context);
+}