Add a force-layout-height-to-zero layout mode to WebViewImpl

Source/web/WebViewImpl.h

 /*
  * Copyright (C) 2010 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 174 matching lines @@
     virtual WebFloatPoint pinchViewportOffset() const OVERRIDE;
     virtual float minimumPageScaleFactor() const OVERRIDE;
     virtual float maximumPageScaleFactor() const OVERRIDE;
     virtual void resetScrollAndScaleState() OVERRIDE;
     virtual void setIgnoreViewportTagScaleLimits(bool) OVERRIDE;
     virtual WebSize contentsPreferredMinimumSize() OVERRIDE;
 
     virtual float deviceScaleFactor() const OVERRIDE;
     virtual void setDeviceScaleFactor(float) OVERRIDE;
 
+    virtual void setForceZeroLayoutHeight(bool enable) OVERRIDE;
     virtual void setFixedLayoutSize(const WebSize&) OVERRIDE;
 
     virtual void enableAutoResizeMode(
         const WebSize& minSize,
         const WebSize& maxSize) OVERRIDE;
     virtual void disableAutoResizeMode() OVERRIDE;
     virtual void performMediaPlayerAction(
         const WebMediaPlayerAction& action,
         const WebPoint& location) OVERRIDE;
     virtual void performPluginAction(
@@ skipping 366 matching lines @@
     ContextMenuClientImpl m_contextMenuClientImpl;
     DragClientImpl m_dragClientImpl;
     EditorClientImpl m_editorClientImpl;
     InspectorClientImpl m_inspectorClientImpl;
     BackForwardClientImpl m_backForwardClientImpl;
     SpellCheckerClientImpl m_spellCheckerClientImpl;
     StorageClientImpl m_storageClientImpl;
 
     WebSize m_size;
     bool m_fixedLayoutSizeLock;
+    bool m_forceZeroLayoutHeight;
     // If true, automatically resize the render view around its content.
     bool m_shouldAutoResize;
     // The lower bound on the size when auto-resizing.
     WebCore::IntSize m_minAutoSize;
     // The upper bound on the size when auto-resizing.
     WebCore::IntSize m_maxAutoSize;
 
     OwnPtrWillBePersistent<WebCore::Page> m_page;
 
     // An object that can be used to manipulate m_page->settings() without linking
@@ skipping 121 matching lines @@
     bool m_userGestureObserved;
 };
 
 // We have no ways to check if the specified WebView is an instance of
 // WebViewImpl because WebViewImpl is the only implementation of WebView.
 DEFINE_TYPE_CASTS(WebViewImpl, WebView, webView, true, true);
 
 } // namespace blink
 
 #endif