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This CL adds a listener to the settings subpage that will allow setting
the filter value. The filter may be cleared by setting the value to ''.

Bug: 770423
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: If4ac8e4bb1f1b38224b52e970f549293ff9b5e9d
Reviewed-on: https://chromium-review.googlesource.com/693390
Commit-Queue: Dave Schuyler <dschuyler@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#506486}