Roll src/third_party/skia/ 57e0828fa..3e4d1fde7 (2 commits)

https://skia.googlesource.com/skia.git/+log/57e0828fade9..3e4d1fde7fab

$ git log 57e0828fa..3e4d1fde7 --date=short --no-merges --format='%ad %ae %s'
2017-11-17 angle-deps-roller Roll skia/third_party/externals/angle2/ 1eda27a65..2c7f34c83 (2 commits)
2017-11-17 scroggo Fix webp bug compositing alpha frames on opaque (better fix)

Created with:
  roll-dep src/third_party/skia
BUG=735497,784078


The AutoRoll server is located here: https://autoroll.skia.org

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

If the roll is causing failures, please contact the current sheriff, who should
be CC'd on the roll, and stop the roller if necessary.


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
TBR=brianosman@chromium.org

Change-Id: I1f45988b72e5268b343dd4f575c23bb0c8ed51fc
Reviewed-on: https://chromium-review.googlesource.com/776644Reviewed-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@{#517463}

DEPS

@@ -74,7 +74,7 @@ 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': '57e0828fade9270f1fd3abf32f4e27b108c4bc1a',
+  'skia_revision': '3e4d1fde7fab46875cb70e23003b40aac262f0bc',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.