Add CPU metrics provider and Add CPU/GPU provider for UKM.

Bug: 907674
Change-Id: I61b88aeac8d2a7ff81d812fa5a267f48203ec7e2
Reviewed-on: https://chromium-review.googlesource.com/c/1381376
Commit-Queue: Nik Bhagat <nikunjb@chromium.org>
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#618037}
bool ChromeMetricsServiceClient::SyncStateAllowsUkm() {
  return SyncDisableObserver::SyncStateAllowsUkm();
}

bool ChromeMetricsServiceClient::SyncStateAllowsUkm() {
  return SyncDisableObserver::SyncStateAllowsUkm();
}
