- Refactor SliceContextualCardRenderer to support for displaying slice in half/full width card. - Add two helper classes to separately deal with different card width. Only the skeleton of the half card helper is put in this CL, the implementation hasn't been filled in yet. Will implement the detail in next CL. Bug: 119655434 Test: visual, robotests Change-Id: Iacdc90c23bf41cfa7ccae3c0c70a3b663e89307d