Implement a trivial Mojo EchoService that can be connected to over DBus

mojo/examples/dbus_echo/dbus_echo_app.cc

Index: mojo/examples/dbus_echo/dbus_echo_app.cc
diff --git a/mojo/examples/dbus_echo/dbus_echo_app.cc b/mojo/examples/dbus_echo/dbus_echo_app.cc
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+++ b/mojo/examples/dbus_echo/dbus_echo_app.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 <stdio.h>
+#include <string>
+
+#include "base/bind.h"
+#include "base/logging.h"
+#include "mojo/public/cpp/bindings/allocation_scope.h"
+#include "mojo/public/cpp/bindings/remote_ptr.h"
+#include "mojo/public/cpp/environment/environment.h"
+#include "mojo/public/cpp/shell/application.h"
+#include "mojo/public/cpp/system/core.h"
+#include "mojo/public/cpp/system/macros.h"
+#include "mojo/public/cpp/utility/run_loop.h"
+#include "mojo/public/interfaces/shell/shell.mojom.h"
+#include "mojo/services/dbus_echo/echo.mojom.h"
+
+#if defined(WIN32)
+#if !defined(CDECL)
+#define CDECL __cdecl
+#endif
+#define DBUS_ECHO_APP_EXPORT __declspec(dllexport)
+#else
+#define CDECL
+#define DBUS_ECHO_APP_EXPORT __attribute__((visibility("default")))
+#endif
+
+namespace mojo {
+namespace examples {
+
+class DBusEchoApp : public Application, public mojo::EchoClient {
+ public:
+  explicit DBusEchoApp(MojoHandle shell_handle) : Application(shell_handle) {
+    InterfacePipe<EchoService, AnyInterface> echo_pipe;
+    mojo::AllocationScope scope;
+    shell()->Connect("dbus:org.chromium.EchoService/org/chromium/MojoImpl",
+                     echo_pipe.handle_to_peer.Pass());
+    echo_service_.reset(echo_pipe.handle_to_self.Pass(), this);
+    echo_service_->Echo("who", base::Bind(&DBusEchoApp::OnEcho,
+                                          base::Unretained(this)));
+  }
+
+  virtual ~DBusEchoApp() {
+  }
+
+ private:
+  void OnEcho(const mojo::String& echoed) {
+    LOG(INFO) << "echo'd " << echoed.To<std::string>();
+  }
+
+  RemotePtr<EchoService> echo_service_;
+};
+
+}  // namespace examples
+}  // namespace mojo
+
+extern "C" DBUS_ECHO_APP_EXPORT MojoResult CDECL MojoMain(
+    MojoHandle shell_handle) {
+  mojo::Environment env;
+  mojo::RunLoop loop;
+
+  mojo::examples::DBusEchoApp app(shell_handle);
+  loop.Run();
+  return MOJO_RESULT_OK;
+}