Doris Ling 83e2741bd7 Listen to brigtness updates to update brightness summary.
- add content observer for brightness relates changes, and update the
brightness preference summary when changes occur.
- also check for VR mode and auto brightness mode when reading the
current brightness value.

Bug: 37227609
Test: make RunSettingsRoboTests
Change-Id: I895d251e1dc12cb114ef00328eb8aa0075d77ab1
2017-04-18 11:05:16 -07:00
2015-04-13 09:21:39 -07:00
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