Implement server-suggested update check backoff

chrome/browser/android/webapk/webapk_install_service.cc

Index: chrome/browser/android/webapk/webapk_install_service.cc
diff --git a/chrome/browser/android/webapk/webapk_install_service.cc b/chrome/browser/android/webapk/webapk_install_service.cc
index 153543f1ffd1373416b10988958d1fb34f0d05e5..07974e577bd8c2feddf46a2e495c00099eff718c 100644
--- a/chrome/browser/android/webapk/webapk_install_service.cc
+++ b/chrome/browser/android/webapk/webapk_install_service.cc
@@ -64,7 +64,8 @@ void WebApkInstallService::OnFinishedInstall(
     const GURL& web_manifest_url,
     const FinishCallback& finish_callback,
     bool success,
+    bool relax_updates,
     const std::string& webapk_package_name) {
-  finish_callback.Run(success, webapk_package_name);
+  finish_callback.Run(success, relax_updates, webapk_package_name);
   installs_.erase(web_manifest_url);
 }