Roll Skia from 9500c8b1f943 to bb04e3d47ef8 (3 revisions)

https://skia.googlesource.com/skia.git/+log/9500c8b1f943..bb04e3d47ef8

2021-06-04 johnstiles@google.com Add new FP, GrFragmentProcessor::DestColor.
2021-06-04 johnstiles@google.com Make _dstColor a global variable.
2021-06-04 bsalomon@google.com Limit ANGLE PBO workaround to blocking use of GL_UNPACK_ROW_LENGTH

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 lovisolo@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/+doc/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
Cq-Do-Not-Cancel-Tryjobs: true
Bug: None
Tbr: lovisolo@google.com
Change-Id: I68608326bbda334f66a8deae2b96f783cecf776b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2940977
Commit-Queue: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Bot-Commit: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#889403}
diff --git a/DEPS b/DEPS
index 423a1a7..f7a61ba 100644
--- a/DEPS
+++ b/DEPS
@@ -209,7 +209,7 @@
   # 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': '9500c8b1f9439611c985cbdc3c50602f5f7fae27',
+  'skia_revision': 'bb04e3d47ef89f03e22dcb299d1088fe05834200',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.