Don't bother layout until first navigation is done.

third_party/WebKit/Source/web/tests/WebViewTest.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 2196 matching lines @@
 
 TEST_F(WebViewTest, ChangeDisplayMode)
 {
     URLTestHelpers::registerMockedURLFromBaseURL(WebString::fromUTF8(m_baseURL.c_str()), WebString::fromUTF8("display_mode.html"));
     WebView* webView = m_webViewHelper.initializeAndLoad(m_baseURL + "display_mode.html", true);
 
     std::string content = WebFrameContentDumper::dumpFrameTreeAsText(webView->mainFrame()->toWebLocalFrame(), 21).utf8();
     EXPECT_EQ("regular-ui", content);
 
     webView->setDisplayMode(WebDisplayModeMinimalUi);
+
+    // Required to see any updates in dumpFrameTreeAsText.
+    m_webViewHelper.webView()->updateAllLifecyclePhases();
+
     content = WebFrameContentDumper::dumpFrameTreeAsText(webView->mainFrame()->toWebLocalFrame(), 21).utf8();
     EXPECT_EQ("minimal-ui", content);
     m_webViewHelper.reset();
 }
 
 TEST_F(WebViewTest, AddFrameInCloseUnload)
 {
     CreateChildCounterFrameClient frameClient;
     URLTestHelpers::registerMockedURLFromBaseURL(WebString::fromUTF8(m_baseURL.c_str()), WebString::fromUTF8("add_frame_in_unload.html"));
     m_webViewHelper.initializeAndLoad(m_baseURL + "add_frame_in_unload.html", true, &frameClient);
@@ skipping 999 matching lines @@
     frame->setAutofillClient(&client);
     webView->setInitialFocus(false);
 
     EXPECT_TRUE(webView->confirmComposition(WebString::fromUTF8(std::string("hello").c_str())));
     EXPECT_EQ(1, client.textChangesFromUserGesture());
     EXPECT_FALSE(UserGestureIndicator::processingUserGesture());
     frame->setAutofillClient(0);
 }
 
 } // namespace blink