Add service unittest for WakeLockServiceImpl.

device/wake_lock/fake_wake_lock_service_impl.cc

+// Copyright 2015 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 "device/wake_lock/fake_wake_lock_service_impl.h"
+
+#include <utility>
+
+namespace device {
+
+FakeWakeLockServiceImpl::FakeWakeLockServiceImpl(

[blundell, 2017/06/01 11:35:58]

nit: Let's call this WakeLockServiceImplForTesting and put it directly in the
unittest.

[ke.he, 2017/06/06 05:25:57]

Done.

+    mojom::WakeLockServiceRequest request,
+    mojom::WakeLockType type,
+    mojom::WakeLockReason reason,
+    const std::string& description,
+    int context_id,
+    WakeLockContextCallback native_view_getter,
+    scoped_refptr<base::SingleThreadTaskRunner> file_task_runner)
+    : WakeLockServiceImpl(std::move(request),
+                          type,
+                          reason,
+                          description,
+                          context_id,
+                          native_view_getter,
+                          file_task_runner),
+      has_fake_wake_lock_(false) {}

[blundell, 2017/06/01 11:35:58]

nit: Let's just call this |has_wake_lock_|.

[ke.he, 2017/06/06 05:25:57]

Done.

+
+FakeWakeLockServiceImpl::~FakeWakeLockServiceImpl() {}
+
+void FakeWakeLockServiceImpl::HasWakeLockForTests(
+    const HasWakeLockForTestsCallback& callback) {
+  callback.Run(has_fake_wake_lock_);
+}
+
+void FakeWakeLockServiceImpl::UpdateWakeLock() {
+  DCHECK(num_lock_requests_ >= 0);
+
+  if (num_lock_requests_) {
+    if (!has_fake_wake_lock_)
+      CreateWakeLock();
+  } else {
+    if (has_fake_wake_lock_)
+      RemoveWakeLock();
+  }
+}
+
+void FakeWakeLockServiceImpl::CreateWakeLock() {
+  DCHECK(!has_fake_wake_lock_);
+  has_fake_wake_lock_ = true;
+}
+
+void FakeWakeLockServiceImpl::RemoveWakeLock() {
+  DCHECK(has_fake_wake_lock_);
+  has_fake_wake_lock_ = false;
+}
+
+}  // namespace device