Auto-rebaseline for r167551

http://src.chromium.org/viewvc/blink?view=revision&revision=167551

BUG=344774
TBR=jamesr@chromium.org

Review URL: https://codereview.chromium.org/185553004

git-svn-id: svn://svn.chromium.org/blink/trunk@168279 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Added null check and exception handling to fill, stroke, clip method.
Added null and invalid argument test cases.

Review URL: https://codereview.chromium.org/179493002

git-svn-id: svn://svn.chromium.org/blink/trunk@168280 bbb929c8-8fbe-4397-9dbb-9b2b20218538