Mahi: Add pixel test for summary view

Support the view with pixel test to avoid future regression.

Change-Id: I390acde37e4a7002c3e26cd1adcb53a664e7c88c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5425919


Reviewed-by: Andrew Xu <andrewxu@chromium.org>
Commit-Queue: Andre Le <leandre@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1283464}