Add LargeIconCache and LargeIconServiceFactory for iOS.

ios/chrome/browser/favicon/ios_chrome_large_icon_service_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_service_factory.h"
+
+#include "base/memory/singleton.h"
+#include "base/thread_task_runner_handle.h"
+#include "components/favicon/core/large_icon_service.h"
+#include "components/keyed_service/core/service_access_type.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/favicon_service_factory.h"
+#include "ios/public/provider/chrome/browser/browser_state/chrome_browser_state.h"
+#include "ios/web/public/web_thread.h"
+
+// static
+favicon::LargeIconService* IOSChromeLargeIconServiceFactory::GetForBrowserState(
+    ios::ChromeBrowserState* browser_state) {
+  return static_cast<favicon::LargeIconService*>(
+      GetInstance()->GetServiceForBrowserState(browser_state, true));
+}
+
+// static
+IOSChromeLargeIconServiceFactory*
+IOSChromeLargeIconServiceFactory::GetInstance() {
+  return base::Singleton<IOSChromeLargeIconServiceFactory>::get();
+}
+
+IOSChromeLargeIconServiceFactory::IOSChromeLargeIconServiceFactory()
+    : BrowserStateKeyedServiceFactory(
+          "LargeIconService",
+          BrowserStateDependencyManager::GetInstance()) {}
+
+IOSChromeLargeIconServiceFactory::~IOSChromeLargeIconServiceFactory() {}
+
+scoped_ptr<KeyedService>
+IOSChromeLargeIconServiceFactory::BuildServiceInstanceFor(
+    web::BrowserState* context) const {
+  ios::ChromeBrowserState* browser_state =
+      ios::ChromeBrowserState::FromBrowserState(context);
+
+  return make_scoped_ptr(new favicon::LargeIconService(
+      ios::FaviconServiceFactory::GetForBrowserState(
+          browser_state, ServiceAccessType::EXPLICIT_ACCESS),
+      web::WebThread::GetBlockingPool()));
+}
+
+web::BrowserState* IOSChromeLargeIconServiceFactory::GetBrowserStateToUse(
+    web::BrowserState* context) const {
+  return GetBrowserStateOwnInstanceInIncognito(context);
+}