Roll src/third_party/skia/ e463d9855..898d5b203 (7 commits)

https://skia.googlesource.com/skia.git/+log/e463d9855873..898d5b203487

$ git log e463d9855..898d5b203 --date=short --no-merges --format='%ad %ae %s'
2018-01-04 ethannicholas fixed uninitialized value warning in GrGLShaderStringBuilder
2018-01-04 angle-skia-autoroll Roll skia/third_party/externals/angle2/ bbd9d4c61..02f152399 (1 commit)
2018-01-04 fmalita [skotty] Add ellipse support
2018-01-04 egdaniel Removed unused useCache param in GrYUVProvider
2018-01-04 angle-skia-autoroll Roll skia/third_party/externals/angle2/ 47c8ea3fb..bbd9d4c61 (1 commit)
2018-01-03 fmalita [skotty,sksg] Add support for geometry merge
2018-01-04 brianosman Remove conversion to 8888 of sRGB sources with other configs

Created with:
  roll-dep src/third_party/skia


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=jcgregorio@chromium.org

Change-Id: If4f9148d5b74b2405049022466882b739fce44a8
Reviewed-on: https://chromium-review.googlesource.com/850718Reviewed-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@{#527037}

DEPS

@@ -78,7 +78,7 @@ 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': 'e463d985587389970d6dbe87967c3cedefa9b8e4',
+  'skia_revision': '898d5b20348784fdf65f0decf96fc5d40d99bd95',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.