[PDF] Implement clear() method and a couple fixes.

+ If the clip matches the initial clip, don't set the clip.
+ Don't change the transform for drawPaint.

Review URL: http://codereview.appspot.com/4424041

git-svn-id: http://skia.googlecode.com/svn/trunk@1142 2bbb7eff-a529-9590-31e7-b0007b416f81
2 files changed