Add factory class for CertificateReportingService and a new metrics provider.

chrome/browser/safe_browsing/certificate_reporting_service_factory.h

+// 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.
+
+#ifndef CHROME_BROWSER_SAFE_BROWSING_CERTIFICATE_REPORTING_SERVICE_FACTORY_H_
+#define CHROME_BROWSER_SAFE_BROWSING_CERTIFICATE_REPORTING_SERVICE_FACTORY_H_
+
+#include "base/memory/singleton.h"
+#include "components/keyed_service/content/browser_context_keyed_service_factory.h"
+
+namespace content {
+class BrowserContext;
+}
+
+class CertificateReportingService;
+
+class CertificateReportingServiceFactory
+    : public BrowserContextKeyedServiceFactory {
+ public:
+  // Returns singleton instance of CertificateReportingServiceFactory.
+  static CertificateReportingServiceFactory* GetInstance();
+
+  // Returns the reporting service associated with |context|.
+  static CertificateReportingService* GetForBrowserContext(
+      content::BrowserContext* context);
+
+ private:
+  friend struct base::DefaultSingletonTraits<
+      CertificateReportingServiceFactory>;
+
+  CertificateReportingServiceFactory();
+  ~CertificateReportingServiceFactory() override;
+
+  // BrowserContextKeyedServiceFactory overrides:
+  KeyedService* BuildServiceInstanceFor(
+      content::BrowserContext* context) const override;
+  content::BrowserContext* GetBrowserContextToUse(
+      content::BrowserContext* context) const override;
+
+  DISALLOW_COPY_AND_ASSIGN(CertificateReportingServiceFactory);
+};
+
+#endif  // CHROME_BROWSER_SAFE_BROWSING_CERTIFICATE_REPORTING_SERVICE_FACTORY_H_