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Simple bit-flipping won't generate negative offsets (e.g. large
positive offsets that overflow), so we add a test where we specifically
create the possibility of such.

Also simplify argument passing in the cpp -> js direction, since there isn't
a need to build lists here.  We're only interested in the other direction.

Remove some stray "explicit" keywords and reduce the echo
test iterations since it doesn't prove much.

Review URL: https://codereview.chromium.org/292243002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@271806 0039d316-1c4b-4281-b951-d872f2087c98