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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_FONT_PREWARMER_TAB_HELPER_H_
#define CHROME_BROWSER_FONT_PREWARMER_TAB_HELPER_H_
#include <string>
#include <vector>
#include "content/public/browser/child_process_id.h"
#include "content/public/browser/web_contents_observer.h"
#include "content/public/browser/web_contents_user_data.h"
class Profile;
namespace user_prefs {
class PrefRegistrySyncable;
}
// FontPrewarmerTabHelper is responsible for tracking navigations to the search
// results page of the default search engine and prewarming the fonts that were
// previously used the last time a search results page of the default search
// engine was visited.
class FontPrewarmerTabHelper
: public content::WebContentsObserver,
public content::WebContentsUserData<FontPrewarmerTabHelper> {
public:
FontPrewarmerTabHelper(const FontPrewarmerTabHelper&) = delete;
FontPrewarmerTabHelper& operator=(const FontPrewarmerTabHelper&) = delete;
~FontPrewarmerTabHelper() override;
static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
private:
friend class content::WebContentsUserData<FontPrewarmerTabHelper>;
friend class FontPrewarmerTabHelperTest;
explicit FontPrewarmerTabHelper(content::WebContents* web_contents);
// Testing helpers:
static std::string GetSearchResultsPageFontsPref();
static std::vector<std::string> GetFontNames(Profile* profile);
Profile* GetProfile();
// Returns true if the url of `navigation_handle` is a search results page of
// the default search provider.
bool IsSearchResultsPageNavigation(
content::NavigationHandle* navigation_handle);
// content::WebContentsObserver implementation.
void DidStartNavigation(
content::NavigationHandle* navigation_handle) override;
void ReadyToCommitNavigation(
content::NavigationHandle* navigation_handle) override;
content::ChildProcessId expected_render_process_host_id_;
WEB_CONTENTS_USER_DATA_KEY_DECL();
};
#endif // CHROME_BROWSER_FONT_PREWARMER_TAB_HELPER_H_
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