Allow XHR timeout attribute to be overridden after send(), per spec

Source/core/loader/WorkerThreadableLoader.cpp

Index: Source/core/loader/WorkerThreadableLoader.cpp
diff --git a/Source/core/loader/WorkerThreadableLoader.cpp b/Source/core/loader/WorkerThreadableLoader.cpp
index b4ee50843c962ada01edb1c1be031428711ec5e9..d8cc18bd35608a6d7d21922c52022ed5e188e2a5 100644
--- a/Source/core/loader/WorkerThreadableLoader.cpp
+++ b/Source/core/loader/WorkerThreadableLoader.cpp
@@ -95,6 +95,11 @@ void WorkerThreadableLoader::loadResourceSynchronously(WorkerGlobalScope& worker
     clientBridgePtr->run();
 }
 
+void WorkerThreadableLoader::overrideTimeout(unsigned long timeoutMilliseconds)
+{
+    m_bridge.overrideTimeout(timeoutMilliseconds);
+}
+
 void WorkerThreadableLoader::cancel()
 {
     m_bridge.cancel();
@@ -154,6 +159,23 @@ void WorkerThreadableLoader::MainThreadBridge::destroy()
         createCallbackTask(&MainThreadBridge::mainThreadDestroy, AllowCrossThreadAccess(this)));
 }
 
+void WorkerThreadableLoader::MainThreadBridge::mainThreadOverrideTimeout(ExecutionContext* context, MainThreadBridge* thisPtr, unsigned long timeoutMilliseconds)
+{
+    ASSERT(isMainThread());
+    ASSERT_UNUSED(context, context->isDocument());
+
+    if (!thisPtr->m_mainThreadLoader)
+        return;
+    thisPtr->m_mainThreadLoader->overrideTimeout(timeoutMilliseconds);
+}
+
+void WorkerThreadableLoader::MainThreadBridge::overrideTimeout(unsigned long timeoutMilliseconds)
+{
+    m_loaderProxy.postTaskToLoader(
+        createCallbackTask(&MainThreadBridge::mainThreadOverrideTimeout, AllowCrossThreadAccess(this),
+            timeoutMilliseconds));
+}
+
 void WorkerThreadableLoader::MainThreadBridge::mainThreadCancel(ExecutionContext* context, MainThreadBridge* thisPtr)
 {
     ASSERT(isMainThread());