Begin to enable extension APIs in Extension Service Worker.

content/child/blink_platform_impl.cc

Index: content/child/blink_platform_impl.cc
diff --git a/content/child/blink_platform_impl.cc b/content/child/blink_platform_impl.cc
index fc4bb874db241eb9c0e89e03a068aeab7c134a4c..26c7a1db6e527e0b9ca3367126544da563311715 100644
--- a/content/child/blink_platform_impl.cc
+++ b/content/child/blink_platform_impl.cc
@@ -858,6 +858,11 @@ void BlinkPlatformImpl::willStopWorkerThread() {
   WorkerThreadRegistry::Instance()->WillStopCurrentWorkerThread();
 }
 
+bool BlinkPlatformImpl::allowScriptExtensionForServiceWorker(
+    const blink::WebURL& scriptUrl) {
+  return GetContentClient()->AllowScriptExtensionForServiceWorker(scriptUrl);
+}
+
 blink::WebCrypto* BlinkPlatformImpl::crypto() {
   return &web_crypto_;
 }