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This CL adds the class which logs any ETW events received to the
Windows event log.

Bug: 1144185
Change-Id: I3972e2c5ef91ace511f5bebfa41fa00ff68ac521
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2545564
Commit-Queue: Joe Downing <joedow@chromium.org>
Reviewed-by: Jamie Walch <jamiewalch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#829862}