1 files changed, 60 insertions, 0 deletions
diff --git a/chromium/chrome/browser/prefs/pref_metrics_service.h b/chromium/chrome/browser/prefs/pref_metrics_service.h
new file mode 100644
index 00000000000..a1864def73f
--- /dev/null
+++ b/chromium/chrome/browser/prefs/pref_metrics_service.h
@@ -0,0 +1,60 @@
+// Copyright 2013 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_PREFS_PREF_METRICS_SERVICE_H_
+#define CHROME_BROWSER_PREFS_PREF_METRICS_SERVICE_H_
+
+#include "base/macros.h"
+#include "base/memory/singleton.h"
+#include "base/memory/weak_ptr.h"
+#include "components/keyed_service/content/browser_context_keyed_service_factory.h"
+#include "components/keyed_service/core/keyed_service.h"
+#include "url/gurl.h"
+
+class PrefService;
+class Profile;
+
+// PrefMetricsService is responsible for recording prefs-related UMA stats.
+class PrefMetricsService : public KeyedService {
+ public:
+  explicit PrefMetricsService(Profile* profile);
+  ~PrefMetricsService() override;
+
+  // Records metrics about the state of the homepage on launch.
+  static void RecordHomePageLaunchMetrics(bool show_home_button,
+                                          bool homepage_is_ntp,
+                                          const GURL& homepage_url);
+
+  class Factory : public BrowserContextKeyedServiceFactory {
+   public:
+    static Factory* GetInstance();
+    static PrefMetricsService* GetForProfile(Profile* profile);
+   private:
+    friend struct base::DefaultSingletonTraits<Factory>;
+
+    Factory();
+    ~Factory() override;
+
+    // BrowserContextKeyedServiceFactory implementation
+    KeyedService* BuildServiceInstanceFor(
+        content::BrowserContext* profile) const override;
+    bool ServiceIsCreatedWithBrowserContext() const override;
+    bool ServiceIsNULLWhileTesting() const override;
+    content::BrowserContext* GetBrowserContextToUse(
+        content::BrowserContext* context) const override;
+  };
+
+ private:
+  // Record prefs state on browser context creation.
+  void RecordLaunchPrefs();
+
+  Profile* profile_;
+  PrefService* prefs_;
+
+  base::WeakPtrFactory<PrefMetricsService> weak_factory_{this};
+
+  DISALLOW_COPY_AND_ASSIGN(PrefMetricsService);
+};
+
+#endif  // CHROME_BROWSER_PREFS_PREF_METRICS_SERVICE_H_