chrome/browser/font_prewarmer_tab_helper.h

   1 // Copyright 2021 The Chromium Authors
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CHROME_BROWSER_FONT_PREWARMER_TAB_HELPER_H_
   6 #define CHROME_BROWSER_FONT_PREWARMER_TAB_HELPER_H_
   7
   8 #include <string>
   9 #include <vector>
  10
  11 #include "content/public/browser/web_contents_observer.h"
  12 #include "content/public/browser/web_contents_user_data.h"
  13
  14 class Profile;
  15
  16 namespace user_prefs {
  17 class PrefRegistrySyncable;
  18 }
  19
  20 // FontPrewarmerTabHelper is responsible for tracking navigations to the search
  21 // results page of the default search engine and prewarming the fonts that were
  22 // previously used the last time a search results page of the default search
  23 // engine was visited.
  24 class FontPrewarmerTabHelper
  25     : public content::WebContentsObserver,
  26       public content::WebContentsUserData<FontPrewarmerTabHelper> {
  27  public:
  28   FontPrewarmerTabHelper(const FontPrewarmerTabHelper&) = delete;
  29   FontPrewarmerTabHelper& operator=(const FontPrewarmerTabHelper&) = delete;
  30   ~FontPrewarmerTabHelper() override;
  31
  32   static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
  33
  34  private:
  35   friend class content::WebContentsUserData<FontPrewarmerTabHelper>;
  36   friend class FontPrewarmerTabHelperTest;
  37
  38   explicit FontPrewarmerTabHelper(content::WebContents* web_contents);
  39
  40   // Testing helpers:
  41   static std::string GetSearchResultsPagePrimaryFontsPref();
  42   static std::vector<std::string> GetPrimaryFontNames(Profile* profile);
  43
  44   Profile* GetProfile();
  45
  46   // Returns true if the url of `navigation_handle` is a search results page of
  47   // the default search provider.
  48   bool IsSearchResultsPageNavigation(
  49       content::NavigationHandle* navigation_handle);
  50
  51   // content::WebContentsObserver implementation.
  52   void DidStartNavigation(
  53       content::NavigationHandle* navigation_handle) override;
  54   void ReadyToCommitNavigation(
  55       content::NavigationHandle* navigation_handle) override;
  56
  57   absl::optional<int> expected_render_process_host_id_;
  58
  59   WEB_CONTENTS_USER_DATA_KEY_DECL();
  60 };
  61
  62 #endif  // CHROME_BROWSER_FONT_PREWARMER_TAB_HELPER_H_