Merge "Update READ_FRAME_BUFFER permission docs" into main

        android:featureFlag="!com.android.graphics.surfaceflinger.flags.readback_screenshot" />

    <!-- Allows an application to take screen shots and more generally

         get access to the frame buffer data.

         get access to the frame buffer data. This permission does not grant

         the ability to capture secure content, which is guarded by the

         permission CAPTURE_BLACKOUT_CONTENT.

         <p>Not for use by third-party applications.

          @FlaggedApi(com.android.graphics.surfaceflinger.flags.Flags.FLAG_READBACK_SCREENSHOT)

          @SystemApi