Bypass ServiceWorker when the request originates from isolated world.

third_party/WebKit/Source/core/loader/DocumentThreadableLoader.cpp

Index: third_party/WebKit/Source/core/loader/DocumentThreadableLoader.cpp
diff --git a/third_party/WebKit/Source/core/loader/DocumentThreadableLoader.cpp b/third_party/WebKit/Source/core/loader/DocumentThreadableLoader.cpp
index 49f5f54fbbe7df339a48ade127628ebbee50c4a3..646a208b313264c348a2cc5adf758ebed6e7f87f 100644
--- a/third_party/WebKit/Source/core/loader/DocumentThreadableLoader.cpp
+++ b/third_party/WebKit/Source/core/loader/DocumentThreadableLoader.cpp
@@ -182,6 +182,14 @@ DocumentThreadableLoader::DocumentThreadableLoader(Document& document, Threadabl
             page->chromeClient().didObserveNonGetFetchFromScript();
     }
 
+    if (!document.securityOrigin()->isSameSchemeHostPort(securityOrigin())) {

[hiroshige, 2015/10/15 08:30:02]

nit: Using |m_document| instead of |document| might be better.
|document| is only used for setting |m_document| and other code in
DocumentThreadableLoader uses |m_document|.

[hiroshige, 2015/10/15 08:30:02]

Just for memo:
This condition is also true for file:// origin, but I expect this is OK.

+        ResourceRequest newRequest(request);
+        newRequest.setSkipServiceWorker(true);
+        dispatchInitialRequest(newRequest);
+        // |this| may be dead here in async mode.
+        return;
+    }
+
     // If the fetch request will be handled by the ServiceWorker, the
     // FetchRequestMode of the request must be FetchRequestModeCORS or
     // FetchRequestModeCORSWithForcedPreflight. Otherwise the ServiceWorker can