Roll src/third_party/skia/ 4a603fc59..edc743a57 (2 commits).

https://chromium.googlesource.com/skia.git/+log/4a603fc591dc..edc743a57657

$ git log 4a603fc59..edc743a57 --date=short --no-merges --format='%ad %ae %s'
2016-06-01 bsalomon Add SkPathPriv::IsSimpleClosedRect
2016-06-01 jvanverth Add offset to memory allocations

CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel
TBR=herb@google.com

Review-Url: https://codereview.chromium.org/2029683002
Cr-Commit-Position: refs/heads/master@{#397207}

DEPS

@@ -39,7 +39,7 @@ 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': '4a603fc591dcd36b3cb47344c244ecbbbaf179f4',
+  'skia_revision': 'edc743a57657107b873ed2fc2efeeff1b1efcd23',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.