Roll src/third_party/skia bbfec9db84cf..916a904fb7f2 (4 commits)

https://skia.googlesource.com/skia.git/+log/bbfec9db84cf..916a904fb7f2

git log bbfec9db84cf..916a904fb7f2 --date=short --no-merges --format='%ad %ae %s'
2019-08-20 jlavrova@google.com Placeholders implementation + unit tests
2019-08-20 reed@google.com make pathiter bench a little more realistic
2019-08-20 halcanary@google.com RELEASE_NOTES: note change to SkMallocPixelRef
2019-08-20 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com Roll recipe dependencies (trivial).

Created with:
  gclient setdep -r src/third_party/skia@916a904fb7f2

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=egdaniel@google.com

Bug: None
Change-Id: I0a319c34a907fa3bcb1528ffb705034f5036fecc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1762687Reviewed-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@{#688701}

DEPS

@@ -145,7 +145,7 @@ 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': 'bbfec9db84cf92b0d2c5dec9f77256163cad9e78',
+  'skia_revision': '916a904fb7f2c827ac207e6ae7ecfce53ee85f55',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.