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

examples/http_handler/http_handler.cc

Index: examples/http_handler/http_handler.cc
diff --git a/examples/http_handler/http_handler.cc b/examples/http_handler/http_handler.cc
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+// 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 "base/bind.h"
+#include "mojo/application/application_runner_chromium.h"
+#include "mojo/public/c/system/main.h"
+#include "mojo/public/cpp/application/application_connection.h"
+#include "mojo/public/cpp/application/application_delegate.h"
+#include "mojo/public/cpp/application/application_impl.h"
+#include "mojo/public/cpp/application/interface_factory_impl.h"
+#include "mojo/public/cpp/application/service_provider_impl.h"
+#include "services/http_server/public/http_server.mojom.h"
+#include "services/http_server/public/http_server_util.h"
+
+namespace mojo {
+namespace examples {
+
+// This is an example of a self-contained HTTP handler. It uses the HTTP Server
+// service to handle the HTTP protocol details, and just contains the logic for
+// handling its registered urls.
+class HttpHandler : public ApplicationDelegate,
+                    public HttpServerClient {
+ public:
+  HttpHandler() {}
+  ~HttpHandler() override {}
+
+ private:
+  // ApplicationDelegate:
+  void Initialize(ApplicationImpl* app) override {
+    app->ConnectToService("mojo:http_server", &http_server_service_);
+
+    http_server_service_.set_client(this);
+    http_server_service_->AddHandler(
+        "/test",
+        base::Bind(&HttpHandler::AddHandlerCallback, base::Unretained(this)));
+  }
+
+  // HttpServerClient:
+  void OnHandleRequest(
+      HttpRequestPtr request,
+      const Callback<void(HttpResponsePtr)>& callback) override {
+    callback.Run(CreateHttpResponse(200, "Hello World"));
+  }
+
+  void AddHandlerCallback(bool result) {
+    CHECK(result);
+  }
+
+  HttpServerServicePtr http_server_service_;
+
+  DISALLOW_COPY_AND_ASSIGN(HttpHandler);
+};
+
+}  // namespace examples
+}  // namespace mojo
+
+MojoResult MojoMain(MojoHandle shell_handle) {
+  mojo::ApplicationRunnerChromium runner(new mojo::examples::HttpHandler());
+  return runner.Run(shell_handle);
+}