Roll src/third_party/skia/ aa352de50..c2bd631c4 (3 commits)

https://skia.googlesource.com/skia.git/+log/aa352de50c9d..c2bd631c431c

$ git log aa352de50..c2bd631c4 --date=short --no-merges --format='%ad %ae %s'
2017-07-17 fmalita Remove (now-dead) SK_LEGACY_SWEEP_GRADIENT code
2017-07-17 bsalomon Add support for GL 565 and 4444 configs to test tools
2017-07-17 brianosman Run clang-format on GrCircleBlurFP.cpp

Created with:
  roll-dep src/third_party/skia


Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, see:
http://www.chromium.org/developers/tree-sheriffs/sheriff-details-chromium#TOC-Failures-due-to-DEPS-rolls


CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel;master.tryserver.chromium.android:android_optional_gpu_tests_rel
TBR=caryclark@chromium.org

Change-Id: Ic387c7e5785ab23a4fb06e7b6539e4667941f5a9
Reviewed-on: https://chromium-review.googlesource.com/574930Reviewed-by: Skia Deps Roller <skia-deps-roller@chromium.org>
Commit-Queue: Skia Deps Roller <skia-deps-roller@chromium.org>
Cr-Commit-Position: refs/heads/master@{#487259}

DEPS

@@ -40,7 +40,7 @@ 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': 'aa352de50c9ddd932b6b6576d9f856ec691d10a7',
+  'skia_revision': 'c2bd631c431c6ee865b709bd11e26a9bdceaf5cd',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.