Add GetMimeTypeFromFile to Mojo's network service.

mojo/services/network/network_service_impl.cc

 // 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.
 
 #include "mojo/services/network/network_service_impl.h"
 
 #include "mojo/application/public/cpp/application_connection.h"
 #include "mojo/services/network/cookie_store_impl.h"
 #include "mojo/services/network/http_server_impl.h"
 #include "mojo/services/network/net_adapters.h"
 #include "mojo/services/network/tcp_bound_socket_impl.h"
 #include "mojo/services/network/udp_socket_impl.h"
 #include "mojo/services/network/url_loader_impl.h"
 #include "mojo/services/network/web_socket_impl.h"
+#include "net/base/mime_util.h"
 
 namespace mojo {
 
 NetworkServiceImpl::NetworkServiceImpl(
     ApplicationConnection* connection,
     NetworkContext* context,
     scoped_ptr<mojo::AppRefCount> app_refcount,
     InterfaceRequest<NetworkService> request)
     : context_(context),
       app_refcount_(app_refcount.Pass()),
@@ skipping 46 matching lines @@
 }
 
 void NetworkServiceImpl::CreateHttpServer(
     NetAddressPtr local_address,
     HttpServerDelegatePtr delegate,
     const CreateHttpServerCallback& callback) {
   HttpServerImpl::Create(local_address.Pass(), delegate.Pass(),
                          app_refcount_->Clone(), callback);
 }
 
+void NetworkServiceImpl::GetMimeTypeFromFile(
+    const mojo::String& file_path,
+    const GetMimeTypeFromFileCallback& callback) {
+  std::string mime;
+  net::GetMimeTypeFromFile(
+      base::FilePath::FromUTF8Unsafe(file_path.To<std::string>()), &mime);
+  callback.Run(mime);
+}
+
 }  // namespace mojo