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Add a story to track performance of subsequent open tab search with loading case

Bug: 1099917
Change-Id: I8e37f2f5f6771adcf35923f0c92af61c03d16f97
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2605386Reviewed-by: Thomas Lukaszewicz <tluk@chromium.org>
Reviewed-by: John Chen <johnchen@chromium.org>
Commit-Queue: Yuheng Huang <yuhengh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#840292}