Carry out a resize even if no layout has been performed.

Source/core/page/Page.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All Rights Reserved.
  * Copyright (C) 2008 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * 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,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 441 matching lines @@
 {
     m_multisamplingChangedObservers.remove(observer);
 }
 
 void Page::settingsChanged(SettingsDelegate::ChangeType changeType)
 {
     switch (changeType) {
     case SettingsDelegate::StyleChange:
         setNeedsRecalcStyleInAllFrames();
         break;
+    case SettingsDelegate::ForceZeroLayoutHeightChange:

[gsennton, 2015/02/13 19:41:07]

A new changeType was added here since we would like to call contentsResized()
when the forceZeroLayoutHeightChange setting is updated.
Since the previously used changeType ViewportDescriptionChange was used by other
settings updating those settings would also caused a call to contentsResized().
This extra call seems to have been the source of the flakiness in the earlier
patch sets.

+        if (mainFrame() && mainFrame()->isLocalFrame())
+            deprecatedLocalMainFrame()->view()->didChangeForceLayoutHeightMode();
+        break;
     case SettingsDelegate::ViewportDescriptionChange:
         if (mainFrame() && mainFrame()->isLocalFrame())
             deprecatedLocalMainFrame()->document()->updateViewportDescription();
         break;
     case SettingsDelegate::MediaTypeChange:
         if (m_mainFrame->isLocalFrame()) {
             deprecatedLocalMainFrame()->view()->setMediaType(AtomicString(settings().mediaTypeOverride()));
             setNeedsRecalcStyleInAllFrames();
         }
         break;
@@ skipping 158 matching lines @@
     , inspectorClient(nullptr)
     , spellCheckerClient(nullptr)
 {
 }
 
 Page::PageClients::~PageClients()
 {
 }
 
 } // namespace blink