Log to UMA when x-origin frames (1) are created and (2) become visible

third_party/WebKit/Source/core/loader/DocumentLoader.cpp

 /*
  * Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * 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.
@@ skipping 677 matching lines @@
     if (!init.shouldReuseDefaultView())
         frame->setDOMWindow(LocalDOMWindow::create(*frame));
 
     Document* document = frame->localDOMWindow()->installNewDocument(mimeType, init);
 
     // This should be set before receivedFirstData().
     if (!overridingURL.isEmpty())
         frame->document()->setBaseURLOverride(overridingURL);
 
     frame->loader().didInstallNewDocument(dispatchWindowObjectAvailable);
+    frame->didInstallNewDocument();
 
     // This must be called before DocumentWriter is created, otherwise HTML parser
     // will use stale values from HTMLParserOption.
     if (!dispatchWindowObjectAvailable)
         frame->loader().receivedFirstData();
 
     frame->loader().didBeginDocument();
 
     return DocumentWriter::create(document, parsingPolicy, mimeType, encoding);
 }
@@ skipping 10 matching lines @@
 {
     m_writer = createWriterFor(init, mimeType(), m_writer ? m_writer->encoding() : emptyAtom, true, ForceSynchronousParsing);
     if (!source.isNull())
         m_writer->appendReplacingData(source);
     endWriting(m_writer.get());
 }
 
 DEFINE_WEAK_IDENTIFIER_MAP(DocumentLoader);
 
 } // namespace blink