Roll src/third_party/skia/ 1a2e3e1e7..49fd5d5b7 (4 commits)

https://skia.googlesource.com/skia.git/+log/1a2e3e1e77bf..49fd5d5b7407

$ git log 1a2e3e1e7..49fd5d5b7 --date=short --no-merges --format='%ad %ae %s'
2017-08-03 liyuqian Disable Delta AA for MSVC for now
2017-08-01 brianosman Add support for object creation/snapshot/deletion events
2017-08-03 mtklein same 16->8 bit packing trick for SSE2/SSE4.1
2017-08-03 brianosman Add missing newline to initial DM output

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=liyuqian@chromium.org

Change-Id: Iead48129cdd2f0b130b2625967b4d68145d7c159
Reviewed-on: https://chromium-review.googlesource.com/600889Reviewed-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@{#491845}

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': '1a2e3e1e77bf7d7da31e8403d88b743f74669c3c',
+  'skia_revision': '49fd5d5b74075a48eda83d732f4ae0d172b81cab',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.