Merge "Merge "Update work challenge background image." into nyc-dev am: 726085c5c7
am: cdc59c8709" into nyc-mr1-dev-plus-aosp
am: 5e01c6c2f6
* commit '5e01c6c2f6508b7a167ccc0f900b0938830488a5':
Change-Id: I99429f53fdae516733de5460ec8d192717c242fc
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