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Since they don't need access to the PerformanceManager instance on the
main thread, they can be implemented by calling CallOnGraphImpl(), which
is static.

Bug: 1013127
Change-Id: I3cdb2bc77f2258e013bdc3dd384f1527c08f1d1f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2108086
Commit-Queue: Patrick Monette <pmonette@chromium.org>
Reviewed-by: François Doray <fdoray@chromium.org>
Reviewed-by: Sigurður Ásgeirsson <siggi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#751863}