Add ref count to service workers for extension API.

chrome/browser/extensions/api/tabs/tabs_api.cc

Index: chrome/browser/extensions/api/tabs/tabs_api.cc
diff --git a/chrome/browser/extensions/api/tabs/tabs_api.cc b/chrome/browser/extensions/api/tabs/tabs_api.cc
index 082822b843de360c5af776ec9653ec3abb9dad99..54fe8099122d90a06365263df862945ef1d4d44c 100644
--- a/chrome/browser/extensions/api/tabs/tabs_api.cc
+++ b/chrome/browser/extensions/api/tabs/tabs_api.cc
@@ -1400,9 +1400,19 @@ bool TabsUpdateFunction::UpdateURL(const std::string &url_string,
   if (!url.SchemeIs(url::kJavaScriptScheme))
     DCHECK_EQ(url.spec(), web_contents_->GetURL().spec());
 
+  // Add a fake delay add async behavior (and delay) to chrome.tabs.update().
+  *is_async = true;
+  base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
+      FROM_HERE, base::Bind(&TabsUpdateFunction::AfterFakeAsyncDelay, this),
+      base::TimeDelta::FromSeconds(7));
   return true;
 }
 
+void TabsUpdateFunction::AfterFakeAsyncDelay() {
+  LOG(ERROR) << "chrome.tabs.update: AfterFakeAsyncDelay fired";
+  SendResponse(true);
+}
+
 void TabsUpdateFunction::PopulateResult() {
   if (!has_callback())
     return;