Set the target type when creating the request for main resource

Source/platform/network/ResourceRequest.h

Index: Source/platform/network/ResourceRequest.h
diff --git a/Source/platform/network/ResourceRequest.h b/Source/platform/network/ResourceRequest.h
index 6d132c336e86acd00ade4f07ad462e3fb9e5f51b..04881b32146b76856d2e26b318b4c7fdc868f607 100644
--- a/Source/platform/network/ResourceRequest.h
+++ b/Source/platform/network/ResourceRequest.h
@@ -104,6 +104,10 @@ public:
     // Gets a copy of the data suitable for passing to another thread.
     PassOwnPtr<CrossThreadResourceRequestData> copyData() const;
 
+    // Initializes the TargetType and the ResourceLoadPriority for the main
+    // resource.
+    void initializeForMainResource(bool isMainFrame);
+
     bool isNull() const;
     bool isEmpty() const;