Merge "[flexiglass] Updates AOSP documentation" into main

1.  Set a collection of **aconfig flags** to `true` by running the following

    commands:

    ```console

    $ adb shell device_config override systemui com.android.systemui.keyguard_bottom_area_refactor true

    $ adb shell device_config override systemui com.android.systemui.keyguard_wm_state_refactor true

    $ adb shell device_config override systemui com.android.systemui.migrate_clocks_to_blueprint true

    $ adb shell device_config override systemui com.android.systemui.notification_avalanche_throttle_hun true

    $ adb shell device_config override systemui com.android.systemui.predictive_back_sysui true

    $ adb shell device_config override systemui com.android.systemui.scene_container true

    $ adb shell aflags enable com.android.systemui.keyguard_wm_state_refactor --immediate

    $ adb shell aflags enable com.android.systemui.notification_avalanche_throttle_hun --immediate

    $ adb shell aflags enable com.android.systemui.scene_container --immediate

    ```

2.  **Restart** System UI by issuing the following command:

    ```console

    NOTE: this will be removed proper to the actual release of the framework.

    *(b)* Turn on logging and look for the logging statements in `logcat`:

    ```console

    # Turn on logging from the framework:

    *(b)* look in logcat, see the "Checking if the framework is enabled" section

    below.

    $ adb shell cmd statusbar echo -b SceneFramework:verbose

### Checking if the framework is enabled

Look for the log statements from the framework:

```console

$ adb logcat -v time SceneFramework:* *:S

$ adb logcat -s SceneFramework

```

### Disabling the framework

To **disable** the framework, simply turn off the main aconfig flag:

```console

$ adb shell device_config put systemui com.android.systemui.scene_container false

$ adb shell aflags unset com.android.systemui.scene_container --immediate

```

## Defining a scene