Make profile statistics tasks inspectable by tests

chrome/browser/profiles/profile_statistics.h

 // 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.
 
 #ifndef CHROME_BROWSER_PROFILES_PROFILE_STATISTICS_H_
 #define CHROME_BROWSER_PROFILES_PROFILE_STATISTICS_H_
 
+#include <map>
 #include <string>
 #include <utility>
-#include <vector>
-#include "base/files/file_path.h"
-#include "base/task/cancelable_task_tracker.h"
-#include "chrome/browser/profiles/profile.h"
 
-namespace profiles {
+#include "chrome/browser/profiles/profile_statistics_types.h"
 
-// Constants for the categories in ProfileCategoryStats
-extern const char kProfileStatisticsBrowsingHistory[];
-extern const char kProfileStatisticsPasswords[];
-extern const char kProfileStatisticsBookmarks[];
-extern const char kProfileStatisticsSettings[];
+namespace base {
+class FilePath;
+}  // namespace base
+class Profile;
+class ProfileStatisticsAggregator;
 
-// Definition of a single return value of |ProfileStatisticsCallback|. If
-// |success| is false, the statistics failed to load and |count| is undefined.
-// The data look like these: {"BrowsingHistory", 912, true},
-// {"Passwords", 71, true}, {"Bookmarks", 120, true}, {"Settings", 200, true}
-struct ProfileCategoryStat {
-  std::string category;
-  int count;
-  bool success;
+class ProfileStatistics {
+ public:
+  // Profile Statistics --------------------------------------------------------
+
+  // This function collects statistical information about |profile|, also
+  // returns the information via |callback| if |callback| is not null. The
+  // statistical information is also copied to ProfileInfoCache. Currently
+  // bookmarks, history, logins and preferences are counted. The callback
+  // function will probably be called more than once, so binding parameters with
+  // bind::Passed() is prohibited. Most of the async tasks involved in this
+  // function can be cancelled if |tracker| is not null.
+  static void GatherProfileStatistics(Profile* profile,
+      const profiles::ProfileStatisticsCallback& callback);
+
+  // ProfileInfoCache ----------------------------------------------------------
+
+  // Gets statistical information from ProfileInfoCache.
+  static profiles::ProfileCategoryStats GetProfileStatisticsFromCache(
+      const base::FilePath& profile_path);
+
+  // Sets an individual statistic to ProfileInfoCache.
+  static void SetProfileStatisticsInCache(const base::FilePath& profile_path,
+      const std::string& category, int count);
+
+  static bool HasAggregator(void* profile);
+  static ProfileStatisticsAggregator* const GetAggregator(void* profile);
+  static void RegisterAggregator(void* profile,
+      ProfileStatisticsAggregator* const aggregator);
+  static void DeregisterAggregator(void* profile);
+
+ private:
+  static std::map<void*, ProfileStatisticsAggregator*> aggregators_;

[lwchkg, 2016/01/25 21:35:53]

Having a static member here is not good. Which of the following do you prefer?

(1) Have this class owned by ProfileManager.
(2) Make this class a KeyedService.
(3) Make this class a singleton.

[Mike Lerman, 2016/02/01 16:42:01]

I think this could be a ProfileKeyedService.

 };
 
-// Definition of the return value of |ProfileStatisticsCallback|.
-using ProfileCategoryStats = std::vector<ProfileCategoryStat>;
-
-// Definition of the callback function. Note that a copy of
-// |ProfileCategoryStats| is made each time the callback is called.
-using ProfileStatisticsCallback = base::Callback<void(ProfileCategoryStats)>;
-
-// Profile Statistics ----------------------------------------------------------
-
-// This function collects statistical information about |profile|, also returns
-// the information via |callback| if |callback| is not null. The statistical
-// information is also copied to ProfileInfoCache. Currently bookmarks, history,
-// logins and preferences are counted. The callback function will probably be
-// called more than once, so binding parameters with bind::Passed() is
-// prohibited. Most of the async tasks involved in this function can be
-// cancelled if |tracker| is not null.
-void GatherProfileStatistics(Profile* profile,
-                             const ProfileStatisticsCallback& callback,
-                             base::CancelableTaskTracker* tracker);
-
-// ProfileInfoCache ------------------------------------------------------------
-
-// Gets statistical information from ProfileInfoCache.
-ProfileCategoryStats GetProfileStatisticsFromCache(
-    const base::FilePath& profile_path);
-
-// Sets an individual statistic to ProfileInfoCache.
-void SetProfileStatisticsInCache(const base::FilePath& profile_path,
-                                 const std::string& category, int count);
-
-}  // namespace profiles
-
 #endif  // CHROME_BROWSER_PROFILES_PROFILE_STATISTICS_H_