[SharedArrayBuffer] Throw DataClone error if SharedArrayBuffer can't be sent

third_party/WebKit/Source/bindings/tests/results/core/V8TestObject.cpp

Index: third_party/WebKit/Source/bindings/tests/results/core/V8TestObject.cpp
diff --git a/third_party/WebKit/Source/bindings/tests/results/core/V8TestObject.cpp b/third_party/WebKit/Source/bindings/tests/results/core/V8TestObject.cpp
index 78f97e6833f511152efab7ee4b8e9783bb006f62..ff6aeb900e2ed45c58f3d5bf967ae1a55be6da8e 100644
--- a/third_party/WebKit/Source/bindings/tests/results/core/V8TestObject.cpp
+++ b/third_party/WebKit/Source/bindings/tests/results/core/V8TestObject.cpp
@@ -8249,8 +8249,7 @@ static void postMessageImpl(const char* interfaceName, TestObject* instance, con
     // Clear references to array buffers and image bitmaps from transferables
     // so that the serializer can consider the array buffers as
     // non-transferable and serialize them into the message.
-    ArrayBufferArray transferableArrayBuffers = transferables.array_buffers;
-    transferables.array_buffers.Clear();
+    ArrayBufferArray transferableArrayBuffers = SerializedScriptValue::ExtractNonSharedArrayBuffers(transferables);
     ImageBitmapArray transferableImageBitmaps = transferables.image_bitmaps;
     transferables.image_bitmaps.Clear();
     SerializedScriptValue::SerializeOptions options;
@@ -8259,6 +8258,12 @@ static void postMessageImpl(const char* interfaceName, TestObject* instance, con
     if (exceptionState.HadException())
       return;
 
+    // If the transferable array_buffer list is empty, then it must have been populated with SharedArrayBuffers. They can't be transfered, so throw.
+    if (!message->GetArrayBufferContentsArray()->IsEmpty()) {
+      exceptionState.ThrowDOMException(kDataCloneError, "SharedArrayBuffer can not be sent in this context.");
+      return;
+    }
+
     // Neuter the original array buffers on the sender context.
     SerializedScriptValue::TransferArrayBufferContents(info.GetIsolate(), transferableArrayBuffers, exceptionState);
     if (exceptionState.HadException())