Set focus on filter field in search dialog
Set focus on filter field in search dialog

TBR=jcgregorio
BUG=skia:

Review URL: https://codereview.chromium.org/1535443004

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot