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 4cbcaf9b2963b2b59a74aef71d83d62d766cb250..d9bc0322c46896686207e3456d291bc4acd19c40 100644
--- a/content/child/blink_platform_impl.cc
+++ b/content/child/blink_platform_impl.cc
@@ -855,6 +855,11 @@ void BlinkPlatformImpl::willStopWorkerThread() {
   WorkerThreadRegistry::Instance()->WillStopCurrentWorkerThread();
 }
 
+bool BlinkPlatformImpl::allowScriptExtensionForServiceWorker(
+    const blink::WebURL& scriptUrl) {
+  return GetContentClient()->AllowScriptExtensionForServiceWorker(scriptUrl);
+}
+
 blink::WebCrypto* BlinkPlatformImpl::crypto() {
   return &web_crypto_;
 }