Fix WTF tests on ASAN

R=jochen@chromium.org, kcc@chromium.org
BUG=

Review URL: https://codereview.chromium.org/225143004

git-svn-id: svn://svn.chromium.org/blink/trunk@171849 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Switching Blink to use new Skia SkPictureRecorder API

The Skia SkPicture recording API is changing to make it clearer when the SkPicture is valid. In the new API SkPictureRecorder::endRecording returns the new SkPicture. 

This isn't landable until Skia DEPS rolls past r14171.

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=171691

Review URL: https://codereview.chromium.org/232513004

git-svn-id: svn://svn.chromium.org/blink/trunk@171850 bbb929c8-8fbe-4397-9dbb-9b2b20218538