Adds a way to determine id of content handler that created app

content/browser/mojo/mojo_app_connection_impl.cc

 // Copyright 2015 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 "content/browser/mojo/mojo_app_connection_impl.h"
 
+#include "base/bind.h"
 #include "content/browser/mojo/mojo_shell_context.h"
 #include "mojo/shell/capability_filter.h"
 
 namespace content {
 
 const char kBrowserMojoAppUrl[] = "system:content_browser";
 
+namespace {
+void OnGotContentHandlerID(uint32_t content_handler_id) {}
+}  // namespace
+
 // static
 scoped_ptr<MojoAppConnection> MojoAppConnection::Create(
     const GURL& url,
     const GURL& requestor_url) {
   return scoped_ptr<MojoAppConnection>(
       new MojoAppConnectionImpl(url, requestor_url));
 }
 
 MojoAppConnectionImpl::MojoAppConnectionImpl(const GURL& url,
                                              const GURL& requestor_url) {
   MojoShellContext::ConnectToApplication(
       url, requestor_url, mojo::GetProxy(&services_),
-      mojo::ServiceProviderPtr(), mojo::shell::GetPermissiveCapabilityFilter());
+      mojo::ServiceProviderPtr(), mojo::shell::GetPermissiveCapabilityFilter(),
+      base::Bind(&OnGotContentHandlerID));
 }
 
 MojoAppConnectionImpl::~MojoAppConnectionImpl() {
 }
 
 void MojoAppConnectionImpl::ConnectToService(
     const std::string& service_name,
     mojo::ScopedMessagePipeHandle handle) {
   services_->ConnectToService(service_name, handle.Pass());
 }
 
 }  // namespace content