Roll Skia from e61500059aa7 to 7a7bec371a3c (8 revisions)

https://skia.googlesource.com/skia.git/+log/e61500059aa7..7a7bec371a3c

2020-10-05 johnstiles@google.com Capitalize static class methods.
2020-10-05 ethannicholas@google.com fixed Google3 build failure
2020-10-05 ethannicholas@google.com moved SkSL ForStatement data into IRNode
2020-10-05 bungeman@google.com Reland "Remove use of legacy display globals."
2020-10-05 herb@google.com add pixel xl to skpbench
2020-10-05 nigeltao@google.com Have SkWuffsCodec use PIXEL_BLEND__SRC_OVER
2020-10-05 bsalomon@google.com Remove unused variant of SkImage::MakeFromYUVAPixmaps
2020-10-05 ethannicholas@google.com Revert "Revert "moved SkSL Field data into IRNode""

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 jvanverth@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: jvanverth@google.com
Change-Id: I54690ccc0e72951e5f40742091cfac929c9ce801
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2450790Reviewed-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@{#813926}

DEPS

@@ -195,7 +195,7 @@ 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': 'e61500059aa7471a65631da81aae70bd1111e5be',
+  'skia_revision': '7a7bec371a3c445c28834ebc25b46ddf067cbc67',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.