Add smooth scrolling command line switch for test_shell.

webkit/tools/test_shell/test_shell.h

 /*
  * Copyright (C) 2006 Apple Computer, 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 216 matching lines @@
     // Writes the back-forward list data for this test shell into result.
     void DumpBackForwardList(string16* result);
 
     static void ResetWebPreferences();
 
     static void SetAllowScriptsToCloseWindows();
 
     static void SetAccelerated2dCanvasEnabled(bool enabled);
     static void SetAcceleratedCompositingEnabled(bool enabled);
 
-    WebPreferences* GetWebPreferences() { return web_prefs_; }
+    static WebPreferences* GetWebPreferences();
 
     // Some layout tests hardcode a file:///tmp/LayoutTests URL.  We get around
     // this by substituting "tmp" with the path to the LayoutTests parent dir.
     static std::string RewriteLocalUrl(const std::string& url);
 
     // Set the timeout for running a test.
     static void SetFileTestTimeout(int timeout_ms) {
       file_test_timeout_ms_ = timeout_ms;
     }
 
@@ skipping 182 matching lines @@
 #if defined(OS_WIN)
     // Used by the watchdog to know when it's finished.
     HANDLE finished_event_;
 #endif
 
     // Dump the stats table counters on exit.
     bool dump_stats_table_on_exit_;
 };
 
 #endif  // WEBKIT_TOOLS_TEST_SHELL_TEST_SHELL_H_