Import of the watch repository from Pebble

src/fw/services/common/battery/battery_monitor.h

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+/*
+ * Copyright 2024 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
+ *
+ *     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.
+ */
+
+#pragma once
+#include "services/common/battery/battery_state.h"
+#include "services/common/new_timer/new_timer.h"
+#include <stdbool.h>
+
+// The battery monitor handles power state and associated service control, in response to battery
+// state changes. This includes low power and critical modes.
+
+void battery_monitor_init(void);
+void battery_monitor_handle_state_change_event(PreciseBatteryChargeState state);
+
+// Use the battery state to determine if UI elements should be locked out
+// because the battery is too low
+bool battery_monitor_critical_lockout(void);
+
+// For unit tests
+TimerID battery_monitor_get_standby_timer_id(void);