Turn off the old compositing path for SPv2.

third_party/WebKit/Source/core/layout/LayoutView.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  *
  * 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,
@@ skipping 102 matching lines @@
 }
 
 bool LayoutView::hitTest(HitTestResult& result)
 {
     // We have to recursively update layout/style here because otherwise, when the hit test recurses
     // into a child document, it could trigger a layout on the parent document, which can destroy PaintLayer
     // that are higher up in the call stack, leading to crashes.
     // Note that Document::updateLayout calls its parent's updateLayout.
     // Note that if an iframe has its render pipeline throttled, it will not update layout here,
     // and it will also not propagate the hit test into the iframe's inner document.
-    frameView()->updateLifecycleToCompositingCleanPlusScrolling();
+    frameView()->updateAllLifecyclePhasesExceptPaint();
     HitTestLatencyRecorder hitTestLatencyRecorder(result.hitTestRequest().allowsChildFrameContent());
     return hitTestNoLifecycleUpdate(result);
 }
 
 bool LayoutView::hitTestNoLifecycleUpdate(HitTestResult& result)
 {
     TRACE_EVENT_BEGIN0("blink,devtools.timeline", "HitTest");
     m_hitTestCount++;
 
     ASSERT(!result.hitTestLocation().isRectBasedTest() || result.hitTestRequest().listBased());
@@ skipping 858 matching lines @@
     // of this override. All frame scrolling should be handled by
     // ViewportScrollCallback.
 
     if (!frameView())
         return ScrollResult(false, false, delta.width(), delta.height());
 
     return frameView()->getScrollableArea()->userScroll(granularity, delta);
 }
 
 } // namespace blink