Introduce command buffer control thread

mojo/public/cpp/bindings/binding.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_PUBLIC_CPP_BINDINGS_BINDING_H_
 #define MOJO_PUBLIC_CPP_BINDINGS_BINDING_H_
 
 #include "mojo/public/c/environment/async_waiter.h"
 #include "mojo/public/cpp/bindings/error_handler.h"
 #include "mojo/public/cpp/bindings/interface_ptr.h"
@@ skipping 104 matching lines @@
   }
 
   // ErrorHandler implementation
   void OnConnectionError() override {
     if (error_handler_)
       error_handler_->OnConnectionError();
   }
 
   Interface* impl() { return impl_; }
   Client* client() { return proxy_; }
+
+  bool is_bound() const { return !!internal_router_; }
+
   // Exposed for testing, should not generally be used.
   internal::Router* internal_router() { return internal_router_; }
 
  private:
   internal::Router* internal_router_ = nullptr;
   typename Client::Proxy_* proxy_ = nullptr;
   typename Interface::Stub_ stub_;
   Interface* impl_;
   ErrorHandler* error_handler_ = nullptr;
 
   MOJO_DISALLOW_COPY_AND_ASSIGN(Binding);
 };
 
 }  // namespace mojo
 
 #endif  // MOJO_PUBLIC_CPP_BINDINGS_BINDING_H_