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I often copy flagged tests. This can be achieved by clicking "Flagged"
then one of the copy buttons, but this is sometimes incovenient because
- "Flagged" query is interuptive because it resets the current filters
  making it difficult to return to where I was working on before
  clicking it;
- I often forgot to click the "Flagged" button before copying resulting
  all tests were rebaselined after pasting the list of tests into the
  command line.

Now add a "flagged only" checkbox to indicate whether to copy all or just
flagged tests.

Change-Id: I6a30e5070c724718bb59766f0535153849320d76
Reviewed-on: https://chromium-review.googlesource.com/820682
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Reviewed-by: Aleks Totic <atotic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524323}