Roll src/third_party/skia a53e47fe9483..4135cf0b57c2 (5 commits)

https://skia.googlesource.com/skia.git/+log/a53e47fe9483..4135cf0b57c2

git log a53e47fe9483..4135cf0b57c2 --date=short --no-merges --format='%ad %ae %s'
2019-11-08 mtklein@google.com use round() instead of trunc() to f32->unorm
2019-11-08 jlavrova@google.com Yet another build fix
2019-11-08 mtklein@google.com rename to_i32 -> trunc, and add round
2019-11-08 mtklein@google.com avoid redundant clamps
2019-11-08 mtklein@google.com don't clamp alpha, it's already [0,1]

Created with:
  gclient setdep -r src/third_party/skia@4135cf0b57c2

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/skia-autoroll
Please CC ethannicholas@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

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

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=ethannicholas@google.com

Bug: None
Change-Id: I8cd2dcd82d71352dc997d353334512e79c3a677c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1906297Reviewed-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@{#714000}

DEPS

@@ -172,7 +172,7 @@ 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': 'a53e47fe9483117e65e05a006e88c2cccf974a1a',
+  'skia_revision': '4135cf0b57c2ef71b60ecf973d93eab37032f4f7',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.