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It is used by content/browser/tracing/arc_tracing_agent_impl.{cc,h}, which,
logically, should not depend on chrome compositor.

Also, we want to move arc_tracing_agent_impl to //chrome/browser
(crrev/c/868575) but we do not want to add a dependency from //chrome/browser to
//cc/base ( https://cs.chromium.org/chromium/src/chrome/browser/DEPS?l=89).

TBR=oysteine@chromium.org

Bug: 808839
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.android:android_optional_gpu_tests_rel
Change-Id: I30adee8ee4f3c7e8c4f478f15e6841937b4be96c
Reviewed-on: https://chromium-review.googlesource.com/899858Reviewed-by: danakj <danakj@chromium.org>
Reviewed-by: Ehsan Chiniforooshan <chiniforooshan@chromium.org>
Commit-Queue: Ehsan Chiniforooshan <chiniforooshan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#534796}