scheduler: Add an unthrottled per-frame task runner

third_party/WebKit/Source/core/frame/FrameView.cpp

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999 Lars Knoll <knoll@kde.org>
  *                     1999 Antti Koivisto <koivisto@kde.org>
  *                     2000 Dirk Mueller <mueller@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  *           (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
@@ skipping 4112 matching lines @@
     bool hadEmptyIntersection = m_viewportIntersection.isEmpty();
     updateViewportIntersectionIfNeeded();
 
     // Notify javascript IntersectionObservers
     if (targetState == DocumentLifecycle::PaintClean && frame().document()->intersectionObserverController())
         frame().document()->intersectionObserverController()->computeTrackedIntersectionObservations();
 
     // Adjust render throttling for iframes based on visibility
     bool shouldNotify = !hadValidIntersection || hadEmptyIntersection != m_viewportIntersection.isEmpty();
     if (shouldNotify && !m_renderThrottlingObserverNotificationFactory->isPending())
-        m_frame->frameScheduler()->timerTaskRunner()->postTask(BLINK_FROM_HERE, m_renderThrottlingObserverNotificationFactory->cancelAndCreate());
+        m_frame->frameScheduler()->unthrottledTaskRunner()->postTask(BLINK_FROM_HERE, m_renderThrottlingObserverNotificationFactory->cancelAndCreate());
 
     if (!m_needsUpdateViewportIntersectionInSubtree)
         return;
     m_needsUpdateViewportIntersectionInSubtree = false;
 
     for (Frame* child = m_frame->tree().firstChild(); child; child = child->tree().nextSibling()) {
         if (!child->isLocalFrame())
             continue;
         if (FrameView* view = toLocalFrame(child)->view())
             view->updateViewportIntersectionsForSubtree(targetState);
@@ skipping 95 matching lines @@
     return m_subtreeThrottled || (m_hiddenForThrottling && m_crossOriginForThrottling);
 }
 
 LayoutBox& FrameView::boxForScrollControlPaintInvalidation() const
 {
     ASSERT(!layoutViewItem().isNull());
     return *layoutView();
 }
 
 } // namespace blink