factory_Touchpad: must click more times to pass the test

Now operator should click more times to pass factory_Touchpad test.
The number to click can be passed to test by dargs number_to_click.

TEST=run factory_Touchpad test with dargs 'number_to_click':20,
  check the clicking event tis captured by the test.

Change-Id: Ife34373b1635d3b0548640cdcd0d9553484c1eac
Reviewed-on: https://gerrit.chromium.org/gerrit/35942
Reviewed-by: Cheng-Yi Chiang <cychiang@chromium.org>
Tested-by: Cheng-Yi Chiang <cychiang@chromium.org>
1 file changed