Add support for tracking loading behavior of child frames.

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 221 matching lines @@
 void DocumentLoader::dispatchLinkHeaderPreloads(
     ViewportDescriptionWrapper* viewport,
     LinkLoader::MediaPreloadPolicy mediaPolicy) {
   LinkLoader::loadLinksFromHeader(
       response().httpHeaderField(HTTPNames::Link), response().url(),
       m_frame->document(), NetworkHintsInterfaceImpl(),
       LinkLoader::OnlyLoadResources, mediaPolicy, viewport);
 }
 
 void DocumentLoader::didChangePerformanceTiming() {
-  if (m_frame && m_frame->isMainFrame() && m_state >= Committed) {
+  if (m_frame && m_state >= Committed) {
     localFrameClient().didChangePerformanceTiming();
   }
 }
 
 void DocumentLoader::didObserveLoadingBehavior(
     WebLoadingBehaviorFlag behavior) {
-  if (m_frame && m_frame->isMainFrame()) {
+  if (m_frame) {
     DCHECK_GE(m_state, Committed);
     localFrameClient().didObserveLoadingBehavior(behavior);
   }
 }
 
 void DocumentLoader::updateForSameDocumentNavigation(
     const KURL& newURL,
     SameDocumentNavigationSource sameDocumentNavigationSource) {
   KURL oldURL = m_request.url();
   m_originalRequest.setURL(newURL);
@@ skipping 551 matching lines @@
                              m_writer ? m_writer->encoding() : emptyAtom, true,
                              ForceSynchronousParsing);
   if (!source.isNull())
     m_writer->appendReplacingData(source);
   endWriting();
 }
 
 DEFINE_WEAK_IDENTIFIER_MAP(DocumentLoader);
 
 }  // namespace blink