[Memory-UMA] Implement basic working prototype.

services/resource_coordinator/memory/coordinator/process_map_unittest.cc

+// Copyright 2017 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 <utility>
+
+#include "services/resource_coordinator/memory/coordinator/process_map.h"
+#include "services/service_manager/public/cpp/identity.h"
+#include "services/service_manager/public/interfaces/service_manager.mojom.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace memory_instrumentation {
+
+using RunningServiceInfoPtr = service_manager::mojom::RunningServiceInfoPtr;
+using ServiceManagerListenerRequest =
+    service_manager::mojom::ServiceManagerListenerRequest;
+
+class ProcessMapTest : public testing::Test {
+ public:
+  ProcessMapTest() : process_map_(nullptr) {}
+
+ protected:
+  ProcessMap process_map_;
+};
+
+TEST_F(ProcessMapTest, TypicalCase) {
+  service_manager::Identity id1("id1");
+  EXPECT_EQ(base::kNullProcessId, process_map_.GetProcessId(id1));
+  process_map_.OnInit(std::vector<RunningServiceInfoPtr>());
+  EXPECT_EQ(base::kNullProcessId, process_map_.GetProcessId(id1));
+
+  RunningServiceInfoPtr info(service_manager::mojom::RunningServiceInfo::New());
+  info->identity = id1;
+  info->pid = 1;
+  process_map_.OnServiceCreated(info.Clone());
+  EXPECT_EQ(static_cast<base::ProcessId>(1), process_map_.GetProcessId(id1));
+
+  // Adding a separate service with a different identity should have no effect.
+  info->identity = service_manager::Identity("id2");
+  info->pid = 2;
+  process_map_.OnServiceCreated(info.Clone());
+  EXPECT_EQ(static_cast<base::ProcessId>(1), process_map_.GetProcessId(id1));
+
+  // Once the service is stopped, searching for its id should return a null pid.
+  process_map_.OnServiceStopped(id1);
+  EXPECT_EQ(base::kNullProcessId, process_map_.GetProcessId(id1));
+}
+
+TEST_F(ProcessMapTest, PresentInInit) {
+  service_manager::Identity id1("id1");
+  RunningServiceInfoPtr info(service_manager::mojom::RunningServiceInfo::New());
+  info->identity = id1;
+  info->pid = 1;
+
+  std::vector<RunningServiceInfoPtr> v;
+  v.push_back(std::move(info));
+  process_map_.OnInit(std::move(v));
+  EXPECT_EQ(static_cast<base::ProcessId>(1), process_map_.GetProcessId(id1));
+
+  process_map_.OnServiceStopped(id1);
+  EXPECT_EQ(base::kNullProcessId, process_map_.GetProcessId(id1));
+}
+
+}  // namespace memory_instrumentation