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A pending change to skia will delineate GL-only sources from
multi-GPU interface source lists in the build configuration.
This change serializes the integration of that change between
the two repos.

Change-Id: I12bdc14228fbc9bd56214301fa7ab02eff5b2efc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1910870
Commit-Queue: John Rosasco <rosasco@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
Cr-Commit-Position: refs/heads/master@{#714590}