Turn off the old compositing path for SPv2.

third_party/WebKit/Source/web/WebViewImpl.cpp

 /*
  * Copyright (C) 2011, 2012 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 3505 matching lines @@
         return IntSize();
     LayoutViewItem root = page()->deprecatedLocalMainFrame()->contentLayoutItem();
     if (root.isNull())
         return IntSize();
     return root.documentRect().size();
 }
 
 WebSize WebViewImpl::contentsPreferredMinimumSize()
 {
     if (mainFrameImpl())
-        mainFrameImpl()->frame()->view()->updateLifecycleToCompositingCleanPlusScrolling();
+        mainFrameImpl()->frame()->view()->updateAllLifecyclePhasesExceptPaint();
 
     Document* document = m_page->mainFrame()->isLocalFrame() ? m_page->deprecatedLocalMainFrame()->document() : nullptr;
     if (!document || document->layoutViewItem().isNull() || !document->documentElement() || !document->documentElement()->layoutBox())
         return WebSize();
 
     int widthScaled = document->layoutViewItem().minPreferredLogicalWidth().round(); // Already accounts for zoom.
     int heightScaled = document->documentElement()->layoutBox()->scrollHeight().round();
     return IntSize(widthScaled, heightScaled);
 }
 
@@ skipping 1070 matching lines @@
         return nullptr;
     return focusedFrame;
 }
 
 LocalFrame* WebViewImpl::focusedLocalFrameAvailableForIme() const
 {
     return m_imeAcceptEvents ? focusedLocalFrameInWidget() : nullptr;
 }
 
 } // namespace blink