Start out deferring commits in WebViewImpl.

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 4251 matching lines @@
 {
     if (m_client) {
         m_client->initializeLayerTreeView();
         m_layerTreeView = m_client->layerTreeView();
     }
 
     if (WebDevToolsAgentImpl* devTools = mainFrameDevToolsAgentImpl())
         devTools->layerTreeViewChanged(m_layerTreeView);
 
     m_page->settings().setAcceleratedCompositingEnabled(m_layerTreeView);
-    if (m_layerTreeView)
+    if (m_layerTreeView) {
         m_page->layerTreeViewInitialized(*m_layerTreeView);
+        // We don't yet have a page loaded at this point of the initialization of WebViewImpl.
+        // Suppress commits until Blink generates invalidations so we don't
+        // attempt to paint too early in the next page load.
+        m_layerTreeView->setDeferCommits(true);
+    }
 
     // FIXME: only unittests, click to play, Android printing, and printing (for headers and footers)
     // make this assert necessary. We should make them not hit this code and then delete allowsBrokenNullLayerTreeView.
     DCHECK(m_layerTreeView || !m_client || m_client->allowsBrokenNullLayerTreeView());
 
     if (Platform::current()->isThreadedAnimationEnabled() && m_layerTreeView) {
         m_linkHighlightsTimeline = adoptPtr(CompositorFactory::current().createAnimationTimeline());
         attachCompositorAnimationTimeline(m_linkHighlightsTimeline.get());
     }
 
@@ skipping 234 matching lines @@
 {
     // TODO(oshima): Investigate if this should return the ScreenInfo's scale factor rather than
     // page's scale factor, which can be 1 in use-zoom-for-dsf mode.
     if (!page())
         return 1;
 
     return page()->deviceScaleFactor();
 }
 
 } // namespace blink