Implement updateViaCache flag and no-cache by default for main service worker scripts

content/browser/service_worker/link_header_support.cc

Index: content/browser/service_worker/link_header_support.cc
diff --git a/content/browser/service_worker/link_header_support.cc b/content/browser/service_worker/link_header_support.cc
index 32ce5777969044119357c0eb381863847c7686c7..1dbe2422b45018b64323d8d41db8674d6eeb9c9a 100644
--- a/content/browser/service_worker/link_header_support.cc
+++ b/content/browser/service_worker/link_header_support.cc
@@ -95,6 +95,7 @@ void HandleServiceWorkerLink(
   GURL scope_url = scope_param == params.end()
                        ? script_url.Resolve("./")
                        : context_url.Resolve(scope_param->second.value_or(""));
+  bool use_cache = params.find("usecache") != params.end();
 
   if (!context_url.is_valid() || !script_url.is_valid() ||
       !scope_url.is_valid())
@@ -119,7 +120,7 @@ void HandleServiceWorkerLink(
       "ServiceWorker", "LinkHeaderResourceThrottle::HandleServiceWorkerLink",
       ++trace_id, "Pattern", scope_url.spec(), "Script URL", script_url.spec());
   service_worker_context->RegisterServiceWorker(
-      scope_url, script_url,
+      scope_url, script_url, use_cache,
       base::Bind(&RegisterServiceWorkerFinished, trace_id));
 }