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

tools/clang/blink_gc_plugin/tests/ignore_fields.h

 // 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.
 
 #ifndef IGNORE_FIELDS_H_
 #define IGNORE_FIELDS_H_
 
 #include "heap/stubs.h"
 
 namespace blink {
 
 class HeapObject : public GarbageCollected<HeapObject> {
 public:
-    virtual void trace(Visitor*) { }
+    virtual void Trace(Visitor*) { }
 };
 
 // Don't warn about raw pointers to heap allocated objects.
 class A : public GarbageCollected<A>{
 private:
     GC_PLUGIN_IGNORE("http://crbug.com/12345")
     HeapObject* m_obj;
 };
 
-// Don't require trace method when (all) GC fields are ignored.
+// Don't require Trace method when (all) GC fields are ignored.
 class B : public GarbageCollected<B> {
 private:
     GC_PLUGIN_IGNORE("http://crbug.com/12345")
     Member<HeapObject> m_one;
 };
 
 // Don't require tracing an ignored field.
 class C : public GarbageCollected<C> {
 public:
-    void trace(Visitor*);
+    void Trace(Visitor*);
 private:
     Member<HeapObject> m_one;
     GC_PLUGIN_IGNORE("http://crbug.com/12345")
     Member<HeapObject> m_two;
 };
 
 }
 
 #endif