Make WebFrame::isLoading() local-only and map it to load event completion

public/web/WebLocalFrame.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef WebLocalFrame_h
 #define WebLocalFrame_h
 
 #include "WebFrame.h"
 
 namespace blink {
@@ skipping 19 matching lines @@
 
     // Returns the frame inside a given frame or iframe element. Returns 0 if
     // the given element is not a frame, iframe or if the frame is empty.
     BLINK_EXPORT static WebLocalFrame* fromFrameOwnerElement(const WebElement&);
 
     // Navigation Transitions  ---------------------------------------------
     virtual void addStyleSheetByURL(const WebString& url) = 0;
     virtual void navigateToSandboxedMarkup(const WebData& markup) = 0;
 
     virtual void sendPings(const WebNode& linkNode, const WebURL& destinationURL) = 0;
+
+
+    // Navigation State -------------------------------------------------------
+
+    // Returns true if any resource load is currently in progress. Exposed
+    // primarily for use in layout tests. You probably want isLoading()
+    // instead.
+    virtual bool isResourceLoadInProgress() const = 0;
 };
 
 } // namespace blink
 
 #endif // WebLocalFrame_h