Begin to enable extension APIs in Extension Service Worker.

chrome/browser/extensions/chrome_content_browser_client_extensions_part.cc

Index: chrome/browser/extensions/chrome_content_browser_client_extensions_part.cc
diff --git a/chrome/browser/extensions/chrome_content_browser_client_extensions_part.cc b/chrome/browser/extensions/chrome_content_browser_client_extensions_part.cc
index db7849125222ffadba3999969ce720f5e71ec6a6..a100909769f369e58615f7675e80e9c864374769 100644
--- a/chrome/browser/extensions/chrome_content_browser_client_extensions_part.cc
+++ b/chrome/browser/extensions/chrome_content_browser_client_extensions_part.cc
@@ -35,6 +35,7 @@
 #include "extensions/browser/extension_host.h"
 #include "extensions/browser/extension_message_filter.h"
 #include "extensions/browser/extension_registry.h"
+#include "extensions/browser/extension_service_worker_message_filter.h"
 #include "extensions/browser/extension_system.h"
 #include "extensions/browser/guest_view/extensions_guest_view_message_filter.h"
 #include "extensions/browser/guest_view/web_view/web_view_renderer_state.h"
@@ -496,6 +497,7 @@ void ChromeContentBrowserClientExtensionsPart::RenderProcessWillLaunch(
   host->AddFilter(new ExtensionMessageFilter(id, profile));
   host->AddFilter(new IOThreadExtensionMessageFilter(id, profile));
   host->AddFilter(new ExtensionsGuestViewMessageFilter(id, profile));
+  host->AddFilter(new ExtensionServiceWorkerMessageFilter(id, profile));
   extension_web_request_api_helpers::SendExtensionWebRequestStatusToHost(host);
 }