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This improves the stability of ProfileProviderRealCollectionTest suite
running on VM:

* Increase the default collection duration. Default colleciton duration
is doubled to 2 sec. Jankiness collection duration is increased from 0.5
sec. to 1.5 sec.
* Create a thread that spins the CPU during profile collection. This
ensures that the CPU cycles counter will move forward to trigger perf
collection.

Also improves error logging: on collection failure, log collection
failure reasons recorded in the UMA metric.

Bug: 1132045
Test: Run profile_provider_unittest on crosvm

Change-Id: I600ace7500144398bb7ed56ed80a75fcb1df1907
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2449509
Commit-Queue: Chinglin Yu <chinglinyu@chromium.org>
Reviewed-by: Gabriel Marin <gmx@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816048}