Migrate Timer from location/nearby to third_party/nearby

PiperOrigin-RevId: 501928835

internal/platform/implementation/apple/timer.h

@@ -0,0 +1,43 @@
+// Copyright 2021 Google LLC
+//
+// 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
+//
+//     https://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.
+
+#ifndef PLATFORM_IMPL_APPLE_TIMER_H_
+#define PLATFORM_IMPL_APPLE_TIMER_H_
+#ifdef __cplusplus
+
+#include <functional>
+#include <utility>
+
+#include "internal/platform/implementation/timer.h"
+
+namespace nearby {
+namespace apple {
+
+class Timer : public api::Timer {
+ public:
+  Timer() = default;
+  ~Timer() override = default;
+
+  bool Create(int delay, int interval, std::function<void()> callback) override;
+
+  bool Stop() override;
+
+  bool FireNow() override;
+};
+
+}  // namespace apple
+}  // namespace nearby
+
+#endif
+#endif  // PLATFORM_IMPL_APPLE_TIMER_H_