Add field trial testing config for BoostThreadPriorityOnLibraryLoadingAndBackgroundMode.
This experiment enables: - Use THREAD_MODE_BACKGROUND_BEGIN/END to set the priority of background threads. This affects memory and IO priority in addition to CPU priority. - Increase thread priority to "normal" in scopes where background threads load modules. The expectation is that this will improve responsiveness of Chrome (input delay, first contentful paint), without regressing jank. We are adding the testing config in preparation for enabling this via Finch in M79. Bug: 973868 Change-Id: I467cae12503e3ad724b665f3aebdaeb94e1325c9 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1835023 Commit-Queue: Robert Kaplow <rkaplow@chromium.org> Reviewed-by:Robert Kaplow <rkaplow@chromium.org> Auto-Submit: François Doray <fdoray@chromium.org> Cr-Commit-Position: refs/heads/master@{#705960}
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