Collect host of Web Component usage to send to RAPPOR

Source/core/page/Page.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All Rights Reserved.
  * Copyright (C) 2008 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 198 matching lines @@
     m_mainFrame = mainFrame;
 }
 
 void Page::documentDetached(Document* document)
 {
     m_multisamplingChangedObservers.clear();
     m_pointerLockController->documentDetached(document);
     m_contextMenuController->documentDetached(document);
     if (m_validationMessageClient)
         m_validationMessageClient->documentDetached(*document);
+    m_originsUsingFeatures.documentDetached(*document);
 }
 
 bool Page::openedByDOM() const
 {
     return m_openedByDOM;
 }
 
 void Page::setOpenedByDOM()
 {
     m_openedByDOM = true;
@@ skipping 310 matching lines @@
             view->updateAcceleratedCompositingSettings();
     }
 }
 
 void Page::didCommitLoad(LocalFrame* frame)
 {
     notifyDidCommitLoad(frame);
     if (m_mainFrame == frame) {
         frame->console().clearMessages();
         useCounter().didCommitLoad();
+        m_originsUsingFeatures.updateMeasurementsAndClear();
         UserGestureIndicator::clearProcessedUserGestureSinceLoad();
     }
 }
 
 void Page::acceptLanguagesChanged()
 {
     WillBeHeapVector<RefPtrWillBeMember<LocalFrame>> frames;
 
     // Even though we don't fire an event from here, the LocalDOMWindow's will fire
     // an event so we keep the frames alive until we are done.
@@ skipping 67 matching lines @@
     , dragClient(nullptr)
     , spellCheckerClient(nullptr)
 {
 }
 
 Page::PageClients::~PageClients()
 {
 }
 
 } // namespace blink