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- Add two more screens for the flow.
- Update proto definitions

Bug: b/78190629
Test: Manual
Cq-Include-Trybots: luci.chromium.try:closure_compilation
Change-Id: Ic9a849e3184ea5b09e0f0f338a018caf2193d829
Reviewed-on: https://chromium-review.googlesource.com/1105469
Commit-Queue: Yue Li <updowndota@chromium.org>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569397}