Implement server-suggested update check backoff

chrome/browser/android/webapk/webapk_update_manager.h

Index: chrome/browser/android/webapk/webapk_update_manager.h
diff --git a/chrome/browser/android/webapk/webapk_update_manager.h b/chrome/browser/android/webapk/webapk_update_manager.h
index b6f37c7a80d9acada8fc57976c037ec8abf0cd79..c0fa13bfe444616a98e2910428104ba80eb52c39 100644
--- a/chrome/browser/android/webapk/webapk_update_manager.h
+++ b/chrome/browser/android/webapk/webapk_update_manager.h
@@ -22,7 +22,8 @@ class WebApkUpdateManager {
   // WebAPK will be successfully updated.
   static void OnBuiltWebApk(const std::string& id,
                             bool success,
-                            const std::string& webapk_package);
+                            const std::string& webapk_package,
+                            bool less_updates);
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(WebApkUpdateManager);