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Add UMA metrics Renderer4.MainThread(Gesture|Wheel)ScrollReason2
They deprecate Renderer4.MainThread(Gesture|Wheel)ScrollReason with which we were unable to calculate the percentage of scrolls without any main-thread reason or with a particular reason because each scroll can have multiple main-thread scrolling reasons. In the new metrics, we report "Scrolling on main (any reason)". With this and "Not scrolling on main (no reason)" we can know the total count of scrolls and calculate the percentage of non-main-thread scrolls and main-thread scrolls for a particular reason. Change-Id: Ide9bfd087b32231ad9e99413e5e14fe7ac1d72a3 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3583502 Reviewed-by: Robert Flack <flackr@chromium.org> Reviewed-by: Philip Rogers <pdr@chromium.org> Reviewed-by: Stephen Chenney <schenney@chromium.org> Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org> Cr-Commit-Position: refs/heads/main@{#1028419}
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