Make it possibe to lock the fixedLayoutSize

Source/web/WebViewImpl.h

Index: Source/web/WebViewImpl.h
diff --git a/Source/web/WebViewImpl.h b/Source/web/WebViewImpl.h
index 62dd2149581358cc09b95bb7ca486b655bb3e80f..094dc0d95ac023a97a9a2db7dde31fceb6cdaa34 100644
--- a/Source/web/WebViewImpl.h
+++ b/Source/web/WebViewImpl.h
@@ -241,6 +241,7 @@ public:
     virtual void enableFixedLayoutMode(bool enable);
     virtual WebSize fixedLayoutSize() const;
     virtual void setFixedLayoutSize(const WebSize&);
+    virtual void setForceFixedLayoutSizeToEqualSize(bool);
     virtual void enableAutoResizeMode(
         const WebSize& minSize,
         const WebSize& maxSize);
@@ -667,6 +668,7 @@ private:
     BackForwardClientImpl m_backForwardClientImpl;
 
     WebSize m_size;
+    bool m_forceFixedLayoutSizeToEqualSize;
     // If true, automatically resize the render view around its content.
     bool m_shouldAutoResize;
     // The lower bound on the size when auto-resizing.