Enable Blink to pass extra Mojo handles across MessagePorts

third_party/WebKit/Source/core/dom/MessagePort.cpp

Index: third_party/WebKit/Source/core/dom/MessagePort.cpp
diff --git a/third_party/WebKit/Source/core/dom/MessagePort.cpp b/third_party/WebKit/Source/core/dom/MessagePort.cpp
index 4e4a711cb3ab4bb7aee8fdb7b9b9f0cae920bbe6..840848537d073b0521034150c6ad9ba047647edf 100644
--- a/third_party/WebKit/Source/core/dom/MessagePort.cpp
+++ b/third_party/WebKit/Source/core/dom/MessagePort.cpp
@@ -86,7 +86,9 @@ void MessagePort::postMessage(ScriptState* scriptState,
   WebString messageString = message->toWireString();
   WebMessagePortChannelArray webChannels =
       toWebMessagePortChannelArray(std::move(channels));
-  m_entangledChannel->postMessage(messageString, std::move(webChannels));
+  WebVector<mojo::ScopedHandle> handles;
+  m_entangledChannel->postMessage(messageString, std::move(webChannels),
+                                  std::move(handles));
 }
 
 // static
@@ -169,7 +171,8 @@ static bool tryGetMessageFrom(WebMessagePortChannel& webChannel,
                               MessagePortChannelArray& channels) {
   WebString messageString;
   WebMessagePortChannelArray webChannels;
-  if (!webChannel.tryGetMessage(&messageString, webChannels))
+  WebVector<mojo::ScopedHandle> handles;
+  if (!webChannel.tryGetMessage(&messageString, webChannels, handles))
     return false;
 
   if (webChannels.size()) {