Fix minor problems when resizing/maximizing docked window.

When maximizing the transition should originate from visible bounds, so
the first frame matches what is visible to the user. When switching to
the big surface, we only need to increase the layer by one, instead of
having artificially large value. If we use the large value, it will
cause a flicker over system windows.

Also includes some cleanup, like static imports and necessary logging.

Bug: 24913915

Change-Id: I84d7594622aa639e2008c662f941edf9c20b3202