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Suppose we have a notification with surface size 720x161. In
|UpdatePreferredSize|, we make sure the notification is of width
kNotificationWidth (360). While scaling, 161/2 is truncated to 80.
Later, in |Layout|, we use |contents_size| which holds the truncated 80
to compute the transform. This leads to the notification eventually
being displayed as 720x160. Instead, compute the scale factor based on
the surface width and kNotificationWidth.

BUG=754369

Change-Id: Ib2025bf7aac9d096085e0a641c20c6cc84689503
Reviewed-on: https://chromium-review.googlesource.com/625605Reviewed-by: Yoshiki Iguchi <yoshiki@chromium.org>
Commit-Queue: Eliot Courtney <edcourtney@chromium.org>
Cr-Commit-Position: refs/heads/master@{#496605}