[Skia] Graphics context uses stroke style from previous renderings
[Skia] Graphics context uses stroke style from previous renderings

Fixes an issue where previous stroke styles were used for painting
decorations.

BUG=229579

Review URL: https://chromiumcodereview.appspot.com/15496002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@150708 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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