Mojo JS Bindings: Mojo handles need a toString() method

mojo/bindings/js/handle.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 MOJO_BINDINGS_JS_HANDLE_H_
 #define MOJO_BINDINGS_JS_HANDLE_H_
 
 #include "base/observer_list.h"
 #include "gin/converter.h"
 #include "gin/handle.h"
+#include "gin/object_template_builder.h"
 #include "gin/wrappable.h"
 #include "mojo/public/cpp/system/core.h"
 
 namespace mojo {
 namespace js {
 class HandleCloseObserver;
 
 // Wrapper for mojo Handles exposed to JavaScript. This ensures the Handle
 // is Closed when its JS object is garbage collected.
 class HandleWrapper : public gin::Wrappable<HandleWrapper> {
  public:
   static gin::WrapperInfo kWrapperInfo;
 
   static gin::Handle<HandleWrapper> Create(v8::Isolate* isolate,
                                            MojoHandle handle) {
     return gin::CreateHandle(isolate, new HandleWrapper(handle));
   }
 
+  std::string ToString();
+
+  gin::ObjectTemplateBuilder GetObjectTemplateBuilder(v8::Isolate* isolate)
+      override;
+
   mojo::Handle get() const { return handle_.get(); }
   mojo::Handle release() { return handle_.release(); }
   void Close();
 
   void AddCloseObserver(HandleCloseObserver* observer);
   void RemoveCloseObserver(HandleCloseObserver* observer);
 
  protected:
   HandleWrapper(MojoHandle handle);
   ~HandleWrapper() override;
@@ skipping 41 matching lines @@
       return false;
     }
     *out = gin::Handle<mojo::js::HandleWrapper>(val, object);
     return true;
   }
 };
 
 }  // namespace gin
 
 #endif  // MOJO_BINDINGS_JS_HANDLE_H_