Add ping_responder demo application

This allows us to easily track whether generated code will continue to
compile as we make changes (improvements) to aidl.

Bug: 25035409
Test: This code compiles

Change-Id: Ida69074c4f28e30dfd918792c282e18b8a2677f8
diff --git a/tests/ping_responder/helloc.cpp b/tests/ping_responder/helloc.cpp
new file mode 100644
index 0000000..8caa56f
--- /dev/null
+++ b/tests/ping_responder/helloc.cpp
@@ -0,0 +1,71 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <iostream>
+
+#include <binder/IServiceManager.h>
+#include <utils/String16.h>
+#include <utils/StrongPointer.h>
+
+#include "android/os/IPingResponder.h"
+
+// libutils:
+using android::OK;
+using android::sp;
+using android::status_t;
+using android::String16;
+
+// libbinder:
+using android::getService;
+
+// generated
+using android::os::IPingResponder;
+
+using std::cerr;
+using std::cout;
+using std::endl;
+
+namespace {
+
+const char kServiceName[] = "android.os.IPingResponder";
+
+}  // namespace
+
+int main(int argc, char *argv[]) {
+  sp<IPingResponder> service;
+  cout << "helloc: Retrieving ping service binder" << endl;
+  status_t status = getService(String16(kServiceName), &service);
+  if (status != OK) {
+    cerr << "Failed to get service binder: '" << kServiceName
+         << "' status=" << status << endl;
+    return 1;
+  }
+
+  int32_t token = 1;
+  while (true) {
+    int32_t reply = -1;
+    cout << "Pinging service with " << token << "...";
+    status_t status = service->Ping(token, &reply);
+    if (status == OK)
+      cout << "received " << reply << endl;
+    else
+      cout << "got error " << status << endl;
+    token++;
+    sleep(1);
+  }
+
+  return 0;
+}