jsshell: Fix a destructor crash in newer versions of v8.

Change-Id: I5d95575abee2cdfb07344da0d07acaaba3f5dc98
Provide a way to send GVIZ options along with a transformation.

A feature by which a user can provide configuration options along with the
transformations to be transferred to the underlying gviz chart without
having to explicitly list them in the afterquery code.  This way users have
a tool to, for example, change the look of the chart, activate things such
as logarithmic scales, invert the axes, etc.

Change-Id: I9c574d9699cb481e6cbe10c451dc3ec1ee87bf38