Update PaintLayer size during layout, not after.

third_party/WebKit/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 333 matching lines @@
   // not take the user away from the current page.
   void DidCommitLoad(bool is_new_navigation, bool is_navigation_within_page);
 
   void PostLayoutResize(WebLocalFrameImpl* webframe);
 
   // Indicates two things:
   //   1) This view may have a new layout now.
   //   2) Calling updateAllLifecyclePhases() is a no-op.
   // After calling WebWidget::updateAllLifecyclePhases(), expect to get this
   // notification unless the view did not need a layout.
+  void ResizeAfterLayout(WebLocalFrameImpl*);
   void LayoutUpdated(WebLocalFrameImpl*);
 
   void DidChangeContentsSize();
   void PageScaleFactorChanged();
   void MainFrameScrollOffsetChanged();
 
   // Returns true if popup menus should be rendered by the browser, false if
   // they should be rendered by WebKit (which is the default).
   static bool UseExternalPopupMenus();
 
@@ skipping 377 matching lines @@
   Persistent<ResizeViewportAnchor> resize_viewport_anchor_;
 };
 
 // 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