Roll src/third_party/skia bd5ee543633f..507736fc3abf (3 commits) (flutter/engine#15747)

https://skia.googlesource.com/skia.git/+log/bd5ee543633f..507736fc3abf

git log bd5ee543633f..507736fc3abf --date=short --first-parent --format='%ad %ae %s'
2020-01-17 egdaniel@google.com Check swizzles when building up texture sets to draw.
2020-01-17 robertphillips@google.com Test readPixels on compressed textures
2020-01-17 nifong@google.com Fix compilation settings for wasm debugger

Created with:
  gclient setdep -r src/third_party/skia@507736fc3abf

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': 'bd5ee543633f24e490dce05e9774962885f75104',
+  'skia_revision': '507736fc3abf64397887c6e63728a666e700710d',
 
   # When updating the Dart revision, ensure that all entries that are
   # dependencies of Dart are also updated to match the entries in the

engine/src/flutter/ci/licenses_golden/licenses_skia

@@ -1,4 +1,4 @@
-Signature: 7cfc083e6449a2e9ff9fd772469b02f1
+Signature: 9d510de8301d889846a648e1a08b616e
 
 UNUSED LICENSES: