Make profile statistics tasks inspectable by tests

chrome/browser/profiles/profile_statistics_common.h

Index: chrome/browser/profiles/profile_statistics_common.h
diff --git a/chrome/browser/profiles/profile_statistics_common.h b/chrome/browser/profiles/profile_statistics_common.h
new file mode 100644
index 0000000000000000000000000000000000000000..122e886adc4309563883b745667230be28dcbbeb
--- /dev/null
+++ b/chrome/browser/profiles/profile_statistics_common.h
@@ -0,0 +1,38 @@
+// 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_PROFILES_PROFILE_STATISTICS_COMMON_H_
+#define CHROME_BROWSER_PROFILES_PROFILE_STATISTICS_COMMON_H_
+
+#include <string>
+#include <vector>
+
+#include "base/callback_forward.h"
+
+namespace profiles {
+// Constants for the categories in ProfileCategoryStats
+extern const char kProfileStatisticsBrowsingHistory[];
+extern const char kProfileStatisticsPasswords[];
+extern const char kProfileStatisticsBookmarks[];
+extern const char kProfileStatisticsSettings[];
+
+// 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;
+};
+
+// 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)>;
+}  // namespace profiles
+
+#endif  // CHROME_BROWSER_PROFILES_PROFILE_STATISTICS_COMMON_H_