Fix resetTransform() bug on paths. In order to reset the path transform, we should apply the forward CTM, since the cumulative path transform is the inverted CTM.

BUG=319541

Review URL: https://codereview.chromium.org/68713005

git-svn-id: svn://svn.chromium.org/blink/trunk@162212 bbb929c8-8fbe-4397-9dbb-9b2b20218538