Adjust maximum scroll bounds on FrameView to account for top controls. (Blink-side)

public/web/WebWidget.h

 /*
  * Copyright (C) 2009 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 243 matching lines @@
     // Informs the WebWidget that the resizer rect changed. Happens for example
     // on mac, when a widget appears below the WebWidget without changing the
     // WebWidget's size (WebWidget::resize() automatically checks the resizer
     // rect.)
     virtual void didChangeWindowResizerRect() { }
 
     // The page background color. Can be used for filling in areas without
     // content.
     virtual WebColor backgroundColor() const { return 0xFFFFFFFF; /* SK_ColorWHITE */ }
 
+    // Sets the height subtracted from the Widget to accomodate the top controls.
+    virtual void setTopControlsLayoutHeight(float) { }
+
 protected:
     ~WebWidget() { }
 };
 
 } // namespace blink
 
 #endif