Roll src/third_party/skia 50f377e275c3..7c47d41067d4 (3 commits) (#12231)

https://skia.googlesource.com/skia.git/+log/50f377e275c3..7c47d41067d4

git log 50f377e275c3..7c47d41067d4 --date=short --no-merges --format='%ad %ae %s'
2019-09-11 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com Roll recipe dependencies (trivial).
2019-09-11 bsalomon@google.com Blacklist InitialTextureClear on TecnoSpark3Pro
2019-09-11 nifong@google.com Assert there are some sources when running skpbench

Created with:
  gclient setdep -r src/third_party/skia@7c47d41067d4

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/skia-flutter-autoroll
Please CC mtklein@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

Bug: None
TBR=mtklein@google.com

DEPS

@@ -26,7 +26,7 @@ vars = {
   'skia_git': 'https://skia.googlesource.com',
   # OCMock is for testing only so there is no google clone
   'ocmock_git': 'https://github.com/erikdoe/ocmock.git',
-  'skia_revision': '50f377e275c34fc29fd142b62736b7bc553baa9b',
+  'skia_revision': '7c47d41067d485f90171999dc3845f5b5dc069de',
 
   # When updating the Dart revision, ensure that all entries that are
   # dependencies of Dart are also updated to match the entries in the

ci/licenses_golden/licenses_skia

-Signature: ea72b0375f261e7962a6bdc7a923ae91
+Signature: 92e28f3e50a63299b466b38641b2939e
 
 UNUSED LICENSES:
 
@@ -1562,6 +1562,7 @@ FILE: ../../../third_party/skia/infra/bots/recipes/test.expected/Test-Android-Cl
 FILE: ../../../third_party/skia/infra/bots/recipes/test.expected/Test-Android-Clang-Pixel-GPU-Adreno530-arm-Debug-All-Android_ASAN.json
 FILE: ../../../third_party/skia/infra/bots/recipes/test.expected/Test-Android-Clang-Pixel-GPU-Adreno530-arm64-Debug-All-Android_Vulkan.json
 FILE: ../../../third_party/skia/infra/bots/recipes/test.expected/Test-Android-Clang-Pixel3-GPU-Adreno630-arm64-Debug-All-Android_Vulkan.json
+FILE: ../../../third_party/skia/infra/bots/recipes/test.expected/Test-Android-Clang-TecnoSpark3Pro-GPU-PowerVRGE8320-arm-Debug-All-Android.json
 FILE: ../../../third_party/skia/infra/bots/recipes/test.expected/Test-ChromeOS-Clang-AcerChromebookR13Convertible-GPU-PowerVRGX6250-arm-Debug-All.json
 FILE: ../../../third_party/skia/infra/bots/recipes/test.expected/Test-Chromecast-Clang-Chorizo-CPU-Cortex_A7-arm-Release-All.json
 FILE: ../../../third_party/skia/infra/bots/recipes/test.expected/Test-Chromecast-Clang-Chorizo-GPU-Cortex_A7-arm-Release-All.json