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Create this story to track scroll performance when loading.
Also fix change measure frame time by using benchmark_value.

Bug: 1099917
Change-Id: Ic7b53226fdf189171ffb001db5a45ff05501582d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2586517Reviewed-by: John Chen <johnchen@chromium.org>
Reviewed-by: Thomas Lukaszewicz <tluk@chromium.org>
Commit-Queue: Yuheng Huang <yuhengh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836397}