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This CL modifies the trace events added in
http://crrev.com/c/2229611 to used typed arguments.

It also fixes a typo in an event name (OnDwmCompositionChanged ->
OnDpiChanged).

Change-Id: I04e5c125f1d68be1be2a19414cd363992b7a7b1a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2472501
Commit-Queue: Salvador Guerrero <salg@google.com>
Reviewed-by: oysteine <oysteine@chromium.org>
Reviewed-by: Eric Seckler <eseckler@chromium.org>
Reviewed-by: Robert Liao <robliao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819059}