ImmediateInterpreter: Correctly evaluate gesture before fingers start moving.

From a log Dave Moore gave me, he put one finger down, which put it
into move mode, then put a second finger down a bit later, but it was
stuck in move mode.

BUG=chromium-os:29820
TEST=unittest; replayed failing log to see it work correctly

Change-Id: I4c50b66623a3a6655f4c833b8a284c309338a373
Reviewed-on: https://gerrit.chromium.org/gerrit/20783
Commit-Ready: Andrew de los Reyes <adlr@chromium.org>
Reviewed-by: Andrew de los Reyes <adlr@chromium.org>
Tested-by: Andrew de los Reyes <adlr@chromium.org>
2 files changed