Display: Add brightness_direction field to DisplayBrightnessChanged atom

Introduces a new 'brightness_direction' field to the 'DisplayBrightnessChanged' atom. This change also adds a 'BrightnessDirectionEnum' to define the possible outcomes when a brightness adjustment is made.

Test: StatsD and manual (using device)
Bug: 291013376
Flag: EXEMPT no API change
Change-Id: I937e609d3e94d8a3b62d6c3227b9172a44d77883
2 files changed
tree: a1f1c5c7b5787c522fb40907d60420a5bd0fc369
  1. stats/
  2. OWNERS