Add use-chromium-style-naming option to Blink GC plugin.

tools/clang/blink_gc_plugin/tests/cycle_super.cpp

 // Copyright 2014 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.
 
 #include "cycle_super.h"
 
 namespace blink {
 
-void A::trace(Visitor* visitor) {
-    visitor->trace(m_d);
+void A::Trace(Visitor* visitor) {
+    visitor->Trace(m_d);
 }
 
-void B::trace(Visitor* visitor) {
-    A::trace(visitor);
+void B::Trace(Visitor* visitor) {
+    A::Trace(visitor);
 }
 
-void C::trace(Visitor* visitor) {
-    B::trace(visitor);
+void C::Trace(Visitor* visitor) {
+    B::Trace(visitor);
 }
 
 }