[chromedriver] Disable tests failing on WebView app.

BUG=chromedriver:645
R=craigdh@chromium.org

Review URL: https://codereview.chromium.org/100003002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@238165 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 238165
CustomButtons only clear state on gesture tap cancel and gesture end.

BUG=324506
TEST=CustomButtonTest.GestureEventsSetState

Review URL: https://codereview.chromium.org/96853004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@238166 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 238166