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WindowActivityWatcher logs the WindowMetrics UKM event for a browser
window, with features like window show state and tab count.

Replace the WindowMetrics struct with a public WindowFeatures struct.
The UKM logging function forwards info from the new struct to the
UKM event.

Later we will use the same CreateWindowFeatures function to calculate
tab scores with an ML model. Encapsulating the logic for these features
in a single function ensures that we use the same logic for logging as
we will for inference, and makes the inferencing CL smaller.

Bug: 791824
Change-Id: I940b7fc3d9b6d71d2c23f3a6b054b4f0eb74894a
Reviewed-on: https://chromium-review.googlesource.com/1028563
Commit-Queue: Michael Giuffrida <michaelpg@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555287}