Count how often we'd throw for invalid URLs in window.open

third_party/WebKit/Source/core/page/CreateWindow.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 168 matching lines @@
                         LocalDOMWindow& callingWindow,
                         LocalFrame& firstFrame,
                         LocalFrame& openerFrame) {
   LocalFrame* activeFrame = callingWindow.frame();
   ASSERT(activeFrame);
 
   KURL completedURL = urlString.isEmpty()
                           ? KURL(ParsedURLString, emptyString)
                           : firstFrame.document()->completeURL(urlString);
   if (!completedURL.isEmpty() && !completedURL.isValid()) {
+    UseCounter::count(activeFrame, UseCounter::WindowOpenWithInvalidURL);
     // Don't expose client code to invalid URLs.
     callingWindow.printErrorMessage(
         "Unable to open a window with invalid URL '" +
         completedURL.getString() + "'.\n");
     return nullptr;
   }
 
   FrameLoadRequest frameRequest(callingWindow.document(), completedURL,
                                 frameName);
   frameRequest.setShouldSetOpener(windowFeatures.noopener ? NeverSetOpener
@@ skipping 88 matching lines @@
   }
 
   // TODO(japhet): Form submissions on RemoteFrames don't work yet.
   FrameLoadRequest newRequest(0, request.resourceRequest());
   newRequest.setForm(request.form());
   if (newFrame->isLocalFrame())
     toLocalFrame(newFrame)->loader().load(newRequest);
 }
 
 }  // namespace blink