Don't bother layout until first navigation is done.

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 1841 matching lines @@
     {
         // Avoids unnecessary invalidations while various bits of state in TextAutosizer are updated.
         TextAutosizer::DeferUpdatePageInfo deferUpdatePageInfo(page());
         performResize();
     }
 
     m_fullscreenController->updateSize();
 
     // Update lifecyle phases immediately to recalculate the minimum scale limit for rotation anchoring,
     // and to make sure that no lifecycle states are stale if this WebView is embedded in another one.
-    updateAllLifecyclePhases();
+    if (!view->frame().document()->isInitialEmptyDocument())

[tkent, 2016/02/19 00:43:40]

Is this necessary?

+        updateAllLifecyclePhases();
 }
 
 void WebViewImpl::resize(const WebSize& newSize)
 {
     if (m_shouldAutoResize || m_size == newSize)
         return;
 
     if (page()->mainFrame() && !page()->mainFrame()->isLocalFrame()) {
         // Viewport resize for a remote main frame does not require any
         // particular action, but the state needs to reflect the correct size
@@ skipping 2699 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