[Devtools] Allow User-Agent header override for Websockets

third_party/WebKit/Source/modules/websockets/DocumentWebSocketChannel.cpp

Index: third_party/WebKit/Source/modules/websockets/DocumentWebSocketChannel.cpp
diff --git a/third_party/WebKit/Source/modules/websockets/DocumentWebSocketChannel.cpp b/third_party/WebKit/Source/modules/websockets/DocumentWebSocketChannel.cpp
index ca91d4b9367fc35e544d558094b396e5dba52f12..68788599f1ecfe32b0942baf24149208c0d59465 100644
--- a/third_party/WebKit/Source/modules/websockets/DocumentWebSocketChannel.cpp
+++ b/third_party/WebKit/Source/modules/websockets/DocumentWebSocketChannel.cpp
@@ -182,7 +182,8 @@ bool DocumentWebSocketChannel::connect(const KURL& url, const String& protocol)
 
     if (document()->frame())
         document()->frame()->loader().client()->dispatchWillOpenWebSocket(m_handle.get());
-    m_handle->connect(url, webProtocols, WebSecurityOrigin(getExecutionContext()->getSecurityOrigin()), this);
+
+    m_handle->connect(url, webProtocols, WebSecurityOrigin(getExecutionContext()->getSecurityOrigin()), additionalHeaders(), this);
 
     flowControlIfNecessary();
     TRACE_EVENT_INSTANT1("devtools.timeline", "WebSocketCreate", TRACE_EVENT_SCOPE_THREAD, "data", InspectorWebSocketCreateEvent::data(document(), m_identifier, url, protocol));
@@ -576,6 +577,15 @@ void DocumentWebSocketChannel::didFailLoadingBlob(FileError::ErrorCode errorCode
     // |this| can be deleted here.
 }
 
+String DocumentWebSocketChannel::additionalHeaders()
+{
+    StringBuilder headers;
+    headers.append(HTTPNames::User_Agent);
+    headers.append(':');
+    headers.append(document()->userAgent());
+    return headers.toString();
+}
+
 DEFINE_TRACE(DocumentWebSocketChannel)
 {
     visitor->trace(m_blobLoader);