Settings reset prompt: add startup logic

chrome/common/pref_names.cc

 // Copyright (c) 2012 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 "chrome/common/pref_names.h"
 
 #include "base/macros.h"
 #include "build/build_config.h"
 #include "chrome/common/features.h"
 #include "chrome/common/pref_font_webkit_names.h"
@@ skipping 2460 matching lines @@
     "bookmarks_footnote_ios_promo_dismissed";
 
 // Number of times user has seen the "desktop to iOS" history page promotion.
 const char kNumberHistoryPageIOSPromoShown[] =
     "history_page_ios_promo_shown_count";
 
 // True if the user has dismissed the "desktop to iOS" history page promotion.
 const char kHistoryPageIOSPromoDismissed[] = "history_page_ios_promo_dismissed";
 #endif
 
+// An integer that keeps track of prompt waves for the settings reset
+// prompt. Users will be prompted to reset settings at most once per prompt wave
+// for each setting that the prompt targets (default search, startup URLs and
+// homepage). The value of this setting is controlled by a variations parameter
+// and will be increased when starting a new prompt wave.

[csharp, 2017/03/03 00:50:46]

As discussed, this should probably just check for the value being different,
instead of greater.

[alito, 2017/03/03 01:35:01]

Done.

+const char kSettingsResetPromptPromptWave[] =
+    "settings_reset_prompt.prompt_wave";
+
+// Timestamp of the last time the settings reset prompt was shown during the
+// current prompt wave asking the user if they want to restore their search
+// engine.
+const char kSettingsResetPromptLastTriggeredForDefaultSearch[] =
+    "settings_reset_prompt.last_triggered_for_default_search";
+
+// Timestamp of the last time the settings reset prompt was shown during the
+// current prompt wave asking the user if they want to restore their startup
+// settings.
+const char kSettingsResetPromptLastTriggeredForStartupUrls[] =
+    "settings_reset_prompt.last_triggered_for_startup_urls";
+
+// Timestamp of the last time the settings reset prompt was shown during the
+// current prompt wave asking the user if they want to restore their homepage.
+const char kSettingsResetPromptLastTriggeredForHomepage[] =
+    "settings_reset_prompt.last_triggered_for_homepage";
+
 }  // namespace prefs