Roll Skia from 4470ba1491e5 to d7c4f9d06425 (2 revisions)

https://skia.googlesource.com/skia.git/+log/4470ba1491e5..d7c4f9d06425

2020-07-31 brianosman@google.com Add missing <memory> include
2020-07-31 bsalomon@google.com Don't define SK_GL when no other GPU backends are enabled

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 borenet@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
Bug: None
Tbr: borenet@google.com
Change-Id: I60696b6201e7f03f5461b67b8d0ea4d1f799786e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2331921Reviewed-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@{#793668}

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': '4470ba1491e555c4bb9d6695eb444b6a1b3a0c6b',
+  'skia_revision': 'd7c4f9d06425d8ed5134475e94fb34f265fa1fbc',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.