Add smooth scrolling command line switch for test_shell.

webkit/tools/test_shell/test_shell.cc

Index: webkit/tools/test_shell/test_shell.cc
diff --git a/webkit/tools/test_shell/test_shell.cc b/webkit/tools/test_shell/test_shell.cc
index 0a79030d6173ffc2ab449ca7ace991e3616f387e..e277fcb65b89a6698d368ef954f80191fe4afeca 100644
--- a/webkit/tools/test_shell/test_shell.cc
+++ b/webkit/tools/test_shell/test_shell.cc
@@ -1,4 +1,4 @@
-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
@@ -365,6 +365,12 @@ void TestShell::ResetWebPreferences() {
 }
 
 // static
+WebPreferences* TestShell::GetWebPreferences() {
+  DCHECK(web_prefs_);
+  return web_prefs_;
+}
+
+// static
 bool TestShell::RemoveWindowFromList(gfx::NativeWindow window) {
   WindowList::iterator entry =
       std::find(TestShell::windowList()->begin(),