GitLab

Add TRACE calls to scroll related methods to help with troubleshooting.
TRACE the following methods: ScrollTree::SetScrollOffset,
ScrollTree::OnScrollOffsetAnimated, ScrollableArea::ScrollOffsetChanged.

Bug: 1087088
Change-Id: If0b29816aa7092041f071e6c9b72941105581e52
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2288288
Commit-Queue: Liviu Tinta <liviutinta@chromium.org>
Reviewed-by: Robert Flack <flackr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#786923}