Settings reset prompt: add startup logic

chrome/browser/safe_browsing/settings_reset_prompt/settings_reset_prompt_config.h

 // Copyright 2017 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_SETTINGS_RESET_PROMPT_SETTINGS_RESET_PROMPT_CONFIG_H_
 #define CHROME_BROWSER_SAFE_BROWSING_SETTINGS_RESET_PROMPT_SETTINGS_RESET_PROMPT_CONFIG_H_
 
 #include <cstddef>
 #include <memory>
 #include <string>
@@ skipping 22 matching lines @@
   virtual ~SettingsResetPromptConfig();
 
   // Returns a non-negative integer ID if |url| should trigger a
   // settings reset prompt and a negative integer otherwise. The IDs
   // identify the domains or entities that we want to prompt the user
   // for and can be used for metrics reporting.
   virtual int UrlToResetDomainId(const GURL& url) const;
 
   // The delay before showing the reset prompt after Chrome startup.
   base::TimeDelta delay_before_prompt() const;
+  // Integer that identifies the current prompt wave. This number will increase
+  // with each new prompt wave.
+  int prompt_wave() const;
+  // The minimum time that must pass since the last time the prompt was shown
+  // before a new prompt can be shown. Applies only to prompts shown during the
+  // same prompt wave.
+  base::TimeDelta time_between_prompts() const;
 
  protected:
   SettingsResetPromptConfig();
 
  private:
   using SHA256Hash = std::vector<uint8_t>;
   struct SHA256HashHasher {
     size_t operator()(const SHA256Hash& key) const;
   };
   enum ConfigError : int;
 
   bool Init();
   ConfigError ParseDomainHashes(const std::string& domain_hashes_json);
 
   // Map of 32 byte SHA256 hashes to integer domain IDs.
   std::unordered_map<SHA256Hash, int, SHA256HashHasher> domain_hashes_;
 
   // Other feature parameters.
   base::TimeDelta delay_before_prompt_;
+  int prompt_wave_ = 0;
+  base::TimeDelta time_between_prompts_;
 
   DISALLOW_COPY_AND_ASSIGN(SettingsResetPromptConfig);
 };
 
 }  // namespace safe_browsing
 
 #endif  // CHROME_BROWSER_SAFE_BROWSING_SETTINGS_RESET_PROMPT_SETTINGS_RESET_PROMPT_CONFIG_H_