[automerger skipped] Stop relying on background color attribute to set task transition background am: a5f3e90212 am: 01dd8acb6e -s ours
am skip reason: Merged-In Id42f52760cb9a681c6c33f3c261d7db5e2f71af3 with SHA-1 c26db36f27 is already in history
Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15897416
Change-Id: I7fea4ff65157ada865af51396e4154014a6ada9f
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