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

tools/clang/blink_gc_plugin/tests/fields_require_tracing.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 "fields_require_tracing.h"
 
 namespace blink {
 
-void PartObject::trace(Visitor* visitor) {
-    m_obj1->trace(visitor); // Don't allow direct tracing.
-    visitor->trace(m_obj2);
-    // Missing visitor->trace(m_obj3);
-    visitor->trace(m_parts);
+void PartObject::Trace(Visitor* visitor) {
+    m_obj1->Trace(visitor); // Don't allow direct tracing.
+    visitor->Trace(m_obj2);
+    // Missing visitor->Trace(m_obj3);
+    visitor->Trace(m_parts);
 }
 
-void PartBObject::trace(Visitor* visitor) {
-  // Missing visitor->trace(m_set);
-  visitor->trace(m_vector);
+void PartBObject::Trace(Visitor* visitor) {
+  // Missing visitor->Trace(m_set);
+  visitor->Trace(m_vector);
 }
 
-void HeapObject::trace(Visitor* visitor) {
-    // Missing visitor->trace(m_part);
-    visitor->trace(m_obj);
+void HeapObject::Trace(Visitor* visitor) {
+    // Missing visitor->Trace(m_part);
+    visitor->Trace(m_obj);
 }
 
 }