Fix flaky compositor-touch-hit-rect tests

Fix sorting of the test results so that all displayed properties are used (the only way the sort order can now be ambiguous is if the lines are identical).

Since I needed to update all the test expectations anyway, I also took this opportunity to simplify the output format slightly and not include the rect index value.  This avoids meaningless expected results diff lines when rects are inserted/removed.

BUG=270266

Review URL: https://chromiumcodereview.appspot.com/22663004

git-svn-id: svn://svn.chromium.org/blink/trunk@155939 bbb929c8-8fbe-4397-9dbb-9b2b20218538