Merge "AutoBrightness: Remove handler's messages before send." am: b3230cd639 am: b5d7cf8e9e am: 8ba0cd74bf am: 4611a2da49

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1456125

Change-Id: Iba3f08683af6a3cf18e0f9405bced0f05a6ccc95