c76bb78758f57b064b3e442f8e8e12af84eddbf2
In BatteryTipLoader, two threads may access BatteryDatabaseManager simultaneously. In this case thread A may close the database thread B holds, then settings will crash. In this cl, we make the BatteryDatabaseManager as singleton and synchronize all the database related method. Then it shouldn't have the crash anymore. Bug: 73346734 Test: RunSettingsRoboTests Change-Id: Ib53b2894b25155cca0c6ec60d1a816663d27a578
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