Roll src/third_party/skia/ 927ac9c53..e202bd8b7 (2 commits).

https://chromium.googlesource.com/skia.git/+log/927ac9c53208..e202bd8b71f6

$ git log 927ac9c53..e202bd8b7 --date=short --no-merges --format='%ad %ae %s'
2016-09-19 halcanary SkPDF: SkBitSet gets reset() to make drop() better.
2016-09-19 egdaniel Move vulkan spir-v compile call to GrVkUtil

CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_precise_blink_rel
TBR=borenet@google.com

Review-Url: https://codereview.chromium.org/2349253003
Cr-Commit-Position: refs/heads/master@{#419510}

DEPS

@@ -36,7 +36,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling Skia
   # and whatever else without interference from each other.
-  'skia_revision': '927ac9c532084c816801434340383e4bd822c726',
+  'skia_revision': 'e202bd8b71f6aa184c2c8ce6f653755de1331c88',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.