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This roll is part one of enabling class merging. The next step would be to
actually use it with build rules.

Bug: 1040534
Change-Id: Ife82863d74267c44a10bee4d0f427b937ae197ad
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2033752
Commit-Queue: Sam Maier <smaier@chromium.org>
Auto-Submit: Sam Maier <smaier@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#739383}