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These spinners were no longer clickable as a side-effect of this CL
(https://codereview.chromium.org/657893005) which make the TextViews
inside the spinners clickable. As a result, the Spinner never received
click events.

Also, the spinner dropdown arrow was missing on pre-L devices because we
were creating the Spinner using "new Spinner()" instead of inflating it
from a resource. This is a no-no when using the AppCompat theme.

BUG=435491

Review URL: https://codereview.chromium.org/778533002

Cr-Commit-Position: refs/heads/master@{#306522}