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In UnifiedSystemTray, we only optimize expand/collapse transform when
there is no notification. We should update the layer transform state
when a notification is created during dragging system tray.

TEST=manual
BUG=863577

Change-Id: Iaff5438a9e8f50b621a48cff5c9f197f48d7617e
Reviewed-on: https://chromium-review.googlesource.com/1168709Reviewed-by: Yoshiki Iguchi <yoshiki@chromium.org>
Commit-Queue: Tetsui Ohkubo <tetsui@chromium.org>
Cr-Commit-Position: refs/heads/master@{#581826}