[Autofill] Add support for signin promo on Android

chrome/browser/signin/signin_promo.h

 // Copyright 2013 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_SIGNIN_SIGNIN_PROMO_H_
 #define CHROME_BROWSER_SIGNIN_SIGNIN_PROMO_H_
 
 #include <string>
 
 #include "chrome/browser/ui/profile_chooser_constants.h"
@@ skipping 12 matching lines @@
 const char kSignInPromoQueryKeyAccessPoint[] = "access_point";
 const char kSignInPromoQueryKeyAutoClose[] = "auto_close";
 const char kSignInPromoQueryKeyContinue[] = "continue";
 const char kSignInPromoQueryKeyForceKeepData[] = "force_keep_data";
 const char kSignInPromoQueryKeyReason[] = "reason";
 const char kSignInPromoQueryKeySource[] = "source";
 const char kSignInPromoQueryKeyConstrained[] = "constrained";
 const char kSignInPromoQueryKeyShowAccountManagement[] =
     "showAccountManagement";
 
-// Returns true if the sign in promo should be visible.
-// |profile| is the profile of the tab the promo would be shown on.
-bool ShouldShowPromo(Profile* profile);
-
 // Returns true if we should show the sign in promo at startup.
 bool ShouldShowPromoAtStartup(Profile* profile, bool is_new_profile);
 
 // Called when the sign in promo has been shown so that we can keep track
 // of the number of times we've displayed it.
 void DidShowPromoAtStartup(Profile* profile);
 
 // Registers the fact that the user has skipped the sign in promo.
 void SetUserSkippedPromo(Profile* profile);
 
@@ skipping 52 matching lines @@
 
 // Forces UseWebBasedSigninFlow() to return true when set; used in tests only.
 void ForceWebBasedSigninFlowForTesting(bool force);
 
 // Registers the preferences the Sign In Promo needs.
 void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
 
 }  // namespace signin
 
 #endif  // CHROME_BROWSER_SIGNIN_SIGNIN_PROMO_H_