Roll third_party/externals/swiftshader eea9d35b8757..680d37610656 (7 commits)
Roll third_party/externals/swiftshader eea9d35b8757..680d37610656 (7 commits)

https://swiftshader.googlesource.com/SwiftShader.git/+log/eea9d35b8757..680d37610656

git log eea9d35b8757..680d37610656 --date=short --no-merges --format='%ad %ae %s'
2019-08-29 sugoi@google.com Add VK_IMAGE_USAGE_SAMPLED_BIT to SurfaceKHR
2019-08-29 sugoi@google.com Support for independentBlend feature
2019-08-29 capn@google.com Disable Vulkan projects in Visual Studio solution build
2019-08-29 bclayton@google.com Regres: Adjust constants and include error messages
2019-08-29 bclayton@google.com WSI: Very basic XCB surface implementation.
2019-08-29 swiftshader.regress@gmail.com Regres: Update test lists @ eea9d35b
2019-08-29 chrisforbes@google.com Add support for ImageFormatRg32{f,i,ui}

Created with:
  gclient setdep -r third_party/externals/swiftshader@680d37610656

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/swiftshader-skia-autoroll
Please CC stani@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=skia.primary:Test-Debian9-Clang-GCE-GPU-SwiftShader-x86_64-Debug-All-SwiftShader
Bug: None
TBR=stani@google.com
Change-Id: I64bcffacb1325095f05af4d7481bdcd21ec4b6c0
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/238237
Reviewed-by: skia-autoroll <e034c62197df5622a9c1bef8b3e012f87a0a9840@skia-public.iam.gserviceaccount.com>
Commit-Queue: skia-autoroll <e034c62197df5622a9c1bef8b3e012f87a0a9840@skia-public.iam.gserviceaccount.com>

google/skia,aosp-mirror/platform_external_skia,HalCanary/skia-hc,google/skia,google/skia,HalCanary/skia-hc,HalCanary/skia-hc,google/skia,HalCanary/skia-hc,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia,google/skia,HalCanary/skia-hc,aosp-mirror/platform_external_skia,HalCanary/skia-hc,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia,HalCanary/skia-hc,HalCanary/skia-hc,aosp-mirror/platform_external_skia,google/skia,aosp-mirror/platform_external_skia,HalCanary/skia-hc,aosp-mirror/platform_external_skia,google/skia,HalCanary/skia-hc,google/skia