Adds Settings.System.FONT_SCALE observer to ActivityManagerService
Changes to Settings.System.FONT_SCALE were not being handled by any service, which required a device reboot for any changes to take effect. Changes to this field by the Settings app worked as expected only because it is able to poke ActivityManager with an updated configuration, whereas unbundled applications cannot. This also ensures the setting value is backed up and doesn't conflict with a configured value from accessibility onboarding during restore. Bug:23033258 Change-Id: I98d4aed2f9f5893d054e6b10c4dfda406de8eba2
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