Componentize OriginsSeenService & provide iOS factory.

ios/chrome/browser/metrics/ios_chrome_origins_seen_service_factory.cc

Index: ios/chrome/browser/metrics/ios_chrome_origins_seen_service_factory.cc
diff --git a/ios/chrome/browser/metrics/ios_chrome_origins_seen_service_factory.cc b/ios/chrome/browser/metrics/ios_chrome_origins_seen_service_factory.cc
new file mode 100644
index 0000000000000000000000000000000000000000..f7e75cb72e2567d2735326c29417aee53a6b4cff
--- /dev/null
+++ b/ios/chrome/browser/metrics/ios_chrome_origins_seen_service_factory.cc
@@ -0,0 +1,44 @@
+// 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/metrics/ios_chrome_origins_seen_service_factory.h"
+
+#include "base/memory/ptr_util.h"
+#include "base/memory/singleton.h"
+#include "components/keyed_service/ios/browser_state_dependency_manager.h"
+#include "components/navigation_metrics/origins_seen_service.h"
+#include "ios/chrome/browser/browser_state/browser_state_otr_helper.h"
+#include "ios/chrome/browser/browser_state/chrome_browser_state.h"
+
+// static
+navigation_metrics::OriginsSeenService*
+IOSChromeOriginsSeenServiceFactory::GetForBrowserState(
+    ios::ChromeBrowserState* browser_state) {
+  return static_cast<navigation_metrics::OriginsSeenService*>(
+      GetInstance()->GetServiceForBrowserState(browser_state, true));
+}
+
+// static
+IOSChromeOriginsSeenServiceFactory*
+IOSChromeOriginsSeenServiceFactory::GetInstance() {
+  return base::Singleton<IOSChromeOriginsSeenServiceFactory>::get();
+}
+
+IOSChromeOriginsSeenServiceFactory::IOSChromeOriginsSeenServiceFactory()
+    : BrowserStateKeyedServiceFactory(
+          "OriginsSeenService",
+          BrowserStateDependencyManager::GetInstance()) {}
+
+IOSChromeOriginsSeenServiceFactory::~IOSChromeOriginsSeenServiceFactory() {}
+
+std::unique_ptr<KeyedService>
+IOSChromeOriginsSeenServiceFactory::BuildServiceInstanceFor(
+    web::BrowserState* context) const {
+  return base::WrapUnique(new navigation_metrics::OriginsSeenService());
+}
+
+web::BrowserState* IOSChromeOriginsSeenServiceFactory::GetBrowserStateToUse(
+    web::BrowserState* context) const {
+  return GetBrowserStateOwnInstanceInIncognito(context);
+}