Teach WebURLRequest about Fetch's "frame type" concept.

Source/platform/exported/WebURLRequest.cpp

Index: Source/platform/exported/WebURLRequest.cpp
diff --git a/Source/platform/exported/WebURLRequest.cpp b/Source/platform/exported/WebURLRequest.cpp
index bb1b8e9558e8fcb0fc43516bfbb1d2d698fd4add..c26a6906525187574e967ae7d4755e14d0372884 100644
--- a/Source/platform/exported/WebURLRequest.cpp
+++ b/Source/platform/exported/WebURLRequest.cpp
@@ -229,6 +229,11 @@ WebURLRequest::RequestContext WebURLRequest::requestContext() const
     return m_private->m_resourceRequest->requestContext();
 }
 
+WebURLRequest::FrameType WebURLRequest::frameType() const
+{
+    return m_private->m_resourceRequest->frameType();
+}
+
 WebReferrerPolicy WebURLRequest::referrerPolicy() const
 {
     return static_cast<WebReferrerPolicy>(m_private->m_resourceRequest->referrerPolicy());
@@ -254,6 +259,11 @@ void WebURLRequest::setRequestContext(RequestContext requestContext)
     m_private->m_resourceRequest->setRequestContext(requestContext);
 }
 
+void WebURLRequest::setFrameType(FrameType frameType)
+{
+    m_private->m_resourceRequest->setFrameType(frameType);
+}
+
 int WebURLRequest::requestorID() const
 {
     return m_private->m_resourceRequest->requestorID();