Roll src/third_party/skia b5037ca88923..f050422f3285 (5 commits)

https://skia.googlesource.com/skia.git/+log/b5037ca88923..f050422f3285

git log b5037ca88923..f050422f3285 --date=short --no-merges --format='%ad %ae %s'
2019-09-24 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com Roll recipe dependencies (trivial).
2019-09-24 robertphillips@google.com Add check_mipmaps subtest to BackendAllocation test
2019-09-24 brianosman@google.com SkSL: Support bitwise negation on unsigned integers
2019-09-24 brianosman@google.com When precompiling SkSL, avoid the need to re-link
2019-09-24 nihohit@gmail.com Compile CanvasKit without -fPIC, for latest emscripten compatibility.

Created with:
  gclient setdep -r src/third_party/skia@f050422f3285

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 bungeman@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=bungeman@google.com

Bug: chromium:b/140174804
Change-Id: I169b239ab5127f27aea149f528c18dfbfe4a0612
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1824097Reviewed-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@{#699556}

DEPS

@@ -162,7 +162,7 @@ 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': 'b5037ca88923d5e2caa3dedda58a354dba3c951c',
+  'skia_revision': 'f050422f328552c63ccae590f1af267f63a728b9',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.