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The inspector has a feature for "Scrolling performance issues" under the
bottom console's "Rendering" tab which shows reasons for non-fast
scrolling. This feature did not include main-thread scrolling reasons
such as background-attachment: fixed. This patch adds main-thread
scrolling reasons to the scrolling performance issues visualization.

Bug: 1015918
Change-Id: I46039b4fc8ba3400cab1c2633da31e427865ce3d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1868660Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
Reviewed-by: Stefan Zager <szager@chromium.org>
Auto-Submit: Philip Rogers <pdr@chromium.org>
Commit-Queue: Philip Rogers <pdr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709113}