Roll src/third_party/skia c51d791ab992..459b295bedce (2 commits)

https://skia.googlesource.com/skia.git/+log/c51d791ab992..459b295bedce


git log c51d791ab992..459b295bedce --date=short --no-merges --format='%ad %ae %s'
2019-05-23 robertphillips@google.com Expand backend allocation API to allow an initialization color (only for GL to start)
2019-05-23 ethannicholas@google.com Reland "remove unused functions in sksl.inc"


Created with:
  gclient setdep -r src/third_party/skia@459b295bedce

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

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=luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux-blink-rel;luci.chromium.try:linux-chromeos-compile-dbg;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
TBR=csmartdalton@google.com

Change-Id: I64af50faa16c052b9dbde6e274f8f0d0cd39df6a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1627002Reviewed-by: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#662717}

DEPS

@@ -138,7 +138,7 @@ 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': 'c51d791ab99228a9163c3313bb61015fb096f03f',
+  'skia_revision': '459b295bedce3a9358516d3d16a01764dcc4dd95',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.