Add canvas.style to LegacyCanvasContext
Add canvas.style to LegacyCanvasContext

This field has been added to CanvasContext in commit b1c61992, but
forgotten in LegacyCanvasContext that is still used by non-V8 clients.

Change-Id: I2ae66c098fea15a5c380ab92af0011a01d94b933

pimaxdev/tabris,paulvi/tabris-js,mkostikov/tabris-js,mkostikov/tabris-js,pimaxdev/tabris,eclipsesource/tabris-js,softnep0531/tabrisjs,eclipsesource/tabris-js,eclipsesource/tabris-js,moham3d/tabris-js,softnep0531/tabrisjs,moham3d/tabris-js