Fix SkDraw::validate to work with vector Devices.

Vector devices don't have a (valid) fBitmap, so pass in width and height.

Review URL: http://codereview.appspot.com/2718041

git-svn-id: http://skia.googlecode.com/svn/trunk@616 2bbb7eff-a529-9590-31e7-b0007b416f81
3 files changed