Initialize written paths and strokerecs lazily during GPU drawPath

Initialize SkPaths and SkStrokeRecs lazily during GPU drawPath calls.
The constructors seem to appear in some profiler results on ARM (~1%).

R=bsalomon@google.com, robertphillips@google.com

Author: kkinnunen@nvidia.com

Review URL: https://codereview.chromium.org/118143002

git-svn-id: http://skia.googlecode.com/svn/trunk@13069 2bbb7eff-a529-9590-31e7-b0007b416f81
2 files changed