Roll src/third_party/skia a1ea0a96f490..ce240cc6fd8e (13 commits) (#12750)

https://skia.googlesource.com/skia.git/+log/a1ea0a96f490..ce240cc6fd8e

git log a1ea0a96f490..ce240cc6fd8e --date=short --no-merges --format='%ad %ae %s'
2019-10-02 bsalomon@google.com SkSurface asynchronous read APIs allow client to extend pixel lifetime
2019-10-02 mtklein@google.com picture nesting bounds bug
2019-10-02 halcanary@google.com SkQP: mark readpixels as a bad GM
2019-10-02 brianosman@google.com Fix CheckGeneratedFiles bot by tweaking SkSLDefines some more
2019-10-02 brianosman@google.com Enable asserts about 'in' and 'uniform' in GrSkSLFP and ByteCode
2019-10-02 bsalomon@google.com Half float tests working on command buffer
2019-10-02 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com Roll recipe dependencies (trivial).
2019-10-02 csmartdalton@google.com ccpr: Unblacklist Qualcomm with msaa
2019-10-02 jvanverth@google.com Add less granular version of GrFence for older Metal versions.
2019-10-02 brianosman@google.com ByteCode: Separate uniforms and globals
2019-10-02 mtklein@google.com tidy up SkRecord bounding code
2019-10-02 brianosman@google.com Remove redundant check when encountering fragCoord in IR generator
2019-10-02 csmartdalton@google.com Use GL_QCOM_TILED_RENDERING to explicitly discard stencil

Created with:
  gclient setdep -r src/third_party/skia@ce240cc6fd8e

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 rmistry@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=rmistry@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': 'a1ea0a96f4906012b37814fe51ed7850ce28709d',
+  'skia_revision': 'ce240cc6fd8ec95bd051c7df2173dad2ae8f6ad6',
 
   # 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: 44a37c4c0bdfe00e50546fdf1b9077b0
+Signature: 28fc257accd9528c6d37e667c0f201f5
 
 UNUSED LICENSES:
 
@@ -3819,6 +3819,8 @@ FILE: ../../../third_party/skia/src/core/SkImageFilter_Base.h
 FILE: ../../../third_party/skia/src/core/SkVM.cpp
 FILE: ../../../third_party/skia/src/core/SkVM.h
 FILE: ../../../third_party/skia/src/effects/imagefilters/SkImageFilters.cpp
+FILE: ../../../third_party/skia/src/gpu/GrClientMappedBufferManager.cpp
+FILE: ../../../third_party/skia/src/gpu/GrClientMappedBufferManager.h
 FILE: ../../../third_party/skia/src/gpu/GrCopyRenderTask.cpp
 FILE: ../../../third_party/skia/src/gpu/GrCopyRenderTask.h
 FILE: ../../../third_party/skia/src/gpu/GrImageInfo.h