Add support for HTTP handlers that are in self-contained apps. Also add an example app.

services/http_server/public/http_server_util.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 "services/http_server/public/http_server_util.h"
+
+#include "base/logging.h"
+#include "mojo/public/cpp/system/data_pipe.h"
+
+namespace mojo {
+
+HttpResponsePtr CreateHttpResponse(uint32_t status_code,
+                                   const std::string& body) {
+  HttpResponsePtr response = HttpResponse::New();
+
+  ScopedDataPipeProducerHandle producer_handle;
+  uint32_t num_bytes = static_cast<uint32_t>(body.size());
+  MojoCreateDataPipeOptions options = {sizeof(MojoCreateDataPipeOptions),
+                                       MOJO_CREATE_DATA_PIPE_OPTIONS_FLAG_NONE,
+                                       1,
+                                       num_bytes};
+  MojoResult result = CreateDataPipe(
+      &options, &producer_handle, &response->body);
+  DCHECK_EQ(MOJO_RESULT_OK, result);
+  result = WriteDataRaw(
+      producer_handle.get(), body.c_str(), &num_bytes,
+      MOJO_WRITE_DATA_FLAG_ALL_OR_NONE);
+  DCHECK_EQ(MOJO_RESULT_OK, result);
+  response->status_code = status_code;
+  response->content_length = num_bytes;
+  return response.Pass();
+}
+
+}  // namespace mojo