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Deflake TabSuggestionMessageCardTest

TabContext listens to TabObserver#didFirstVisuallyNonEmptyPaint to
invalidate the existing suggestion and fetch new suggestions. This CL
ensures #didFirstVisuallyNonEmptyPaint is being notified only once
before entering tab switcher.

Bug: 1161272
Change-Id: Ic8a2410a68b116803c9f857bb7321a6a845c5ce0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2626105Reviewed-by: Wei-Yin Chen (陳威尹) <wychen@chromium.org>
Reviewed-by: Yue Zhang <yuezhanggg@chromium.org>
Commit-Queue: Mei Liang <meiliang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844928}