Merge "Document process capability in AppOps.md." into rvc-dev

can fluctuate when switching apps. By delaying the change the appops service is not affected by

those.

The proc state is used for two use cases: Firstly, Tracking remembers the proc state for each

tracked event. Secondly, `noteOp`/`checkOp` calls for app-op that are set to `MODE_FOREGROUND` are

translated using the `AppOpsService.UidState.evalMode` method into `MODE_ALLOWED` when the app is

counted as foreground and `MODE_IGNORED` when the app is counted as background. `checkOpRaw`

calls are not affected.

The current proc state for an app can be read from `dumpsys appops`. The tracking information can

be read from `dumpsys appops`

In addition to proc state, the `AppOpsService` also receives process capability update from the

`ActivityManagerService`. Proc capability specifies what while-in-use(`MODE_FOREGROUND`) operations

 the proc is allowed to perform in its current proc state. There are three proc capabilities

 defined so far: 

`PROCESS_CAPABILITY_FOREGROUND_LOCATION`, `PROCESS_CAPABILITY_FOREGROUND_CAMERA` and

`PROCESS_CAPABILITY_FOREGROUND_MICROPHONE`, they correspond to the while-in-use operation of

location, camera and microphone (microphone is `RECORD_AUDIO`).

In `ActivityManagerService`, `PROCESS_STATE_TOP` and `PROCESS_STATE_PERSISTENT` have all

three capabilities, `PROCESS_STATE_FOREGROUND_SERVICE` has capabilities defined by

 `foregroundServiceType` that is specified in foreground service's manifest file. A client process 

 can pass its capabilities to service using `BIND_INCLUDE_CAPABILITIES` flag.

The proc state and capability are used for two use cases: Firstly, Tracking remembers the proc state

 for each tracked event. Secondly, `noteOp`/`checkOp` calls for app-op that are set to

 `MODE_FOREGROUND` are translated using the `AppOpsService.UidState.evalMode` method into

 `MODE_ALLOWED` when the app has the capability and `MODE_IGNORED` when the app does not have the 

 capability. `checkOpRaw` calls are not affected.

The current proc state and capability for an app can be read from `dumpsys appops`.

The tracking information can be read from `dumpsys appops`

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