mojo: add some end-to-end shell tests and a new test sample app

mojo/services/test_service/test_request_tracker_client_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/test_service/test_request_tracker_client_impl.h"
+
+namespace mojo {
+namespace test {
+
+TestRequestTrackerClientImpl::TestRequestTrackerClientImpl(
+    TestRequestTrackerPtr tracker,
+    const std::string& service_name,
+    const mojo::Callback<void()>& callback)
+    : id_(0),
+      requests_since_upload_(0),
+      service_name_(service_name),
+      tracker_(tracker.Pass()),
+      tracking_connected_callback_(callback) {
+  tracker_.set_client(this);
+}
+
+TestRequestTrackerClientImpl::~TestRequestTrackerClientImpl() {
+}
+
+void TestRequestTrackerClientImpl::RecordNewRequest() {
+  requests_since_upload_++;
+  if (id_ == kInvalidId)
+   return;
+  SendStats();
+}
+
+void TestRequestTrackerClientImpl::SendStats() {
+  ServiceStatsPtr stats(ServiceStats::New());
+  stats->num_new_requests = requests_since_upload_;
+  stats->health = 0.7;
+  tracker_->RecordStats(id_, stats.Pass());
+  requests_since_upload_ = 0;
+}
+
+void TestRequestTrackerClientImpl::SetIdAndReturnName(
+    uint64_t id,
+    const mojo::Callback<void(mojo::String)>& callback) {
+  assert(id != kInvalidId);
+  assert(id_ == kInvalidId);
+  id_ = id;
+  callback.Run(service_name_);
+  tracking_connected_callback_.Run();
+  if (requests_since_upload_ == 0)
+    return;
+  SendStats();
+}
+
+}  // namespace test
+}  // namespace mojo