Add a gin/public directory

gin/test/gtest.cc

 // Copyright 2013 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 "gin/test/gtest.h"
 
 #include "gin/arguments.h"
 #include "gin/converter.h"
 #include "gin/per_isolate_data.h"
-#include "gin/wrapper_info.h"
+#include "gin/public/wrapper_info.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using v8::ObjectTemplate;
 
 namespace gin {
 
 namespace {
 
 void ExpectTrue(const v8::FunctionCallbackInfo<v8::Value>& info) {
   Arguments args(info);
@@ skipping 49 matching lines @@
     templ->Set(StringToSymbol(isolate, "expectFalse"),
                v8::FunctionTemplate::New(ExpectFalse));
     templ->Set(StringToSymbol(isolate, "expectEqual"),
                v8::FunctionTemplate::New(ExpectEqual));
     data->SetObjectTemplate(&g_wrapper_info, templ);
   }
   return templ;
 }
 
 }  // namespace gin