Roll src/third_party/skia/ e202bd8b7..613664b1b (2 commits).

https://chromium.googlesource.com/skia.git/+log/e202bd8b71f6..613664b1bc64

$ git log e202bd8b7..613664b1b --date=short --no-merges --format='%ad %ae %s'
2016-09-19 jvanverth Remove unnecessary assert in GrBatchAtlas.
2016-09-19 csmartdalton skpbench

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

Review-Url: https://codereview.chromium.org/2356433002
Cr-Commit-Position: refs/heads/master@{#419537}

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': 'e202bd8b71f6aa184c2c8ce6f653755de1331c88',
+  'skia_revision': '613664b1bc645de31253c335c4f17e26ca40378f',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.