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This CL pushes the per-row contents of expandable-app-list to being
specified at the client layer, rather than branching with dom-ifs
internally.

Bug: 906508
Change-Id: Icc3b324a408a0a0dd2d487745eda3793e910f143
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1481135
Commit-Queue: calamity <calamity@chromium.org>
Reviewed-by: Alan Cutter <alancutter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#637968}