Roll src/third_party/shaderc/src da52fae116b3..ff260580c07e (1 commits)

https://chromium.googlesource.com/external/github.com/google/shaderc/+log/da52fae116b3..ff260580c07e

git log da52fae116b3..ff260580c07e --date=short --first-parent --format='%ad %ae %s'
2019-11-25 9856269+sarahM0@users.noreply.github.com spvc: Changing the default to pass through - update known_spvc_failure file (#904)

Created with:
  gclient setdep -r src/third_party/shaderc/src@ff260580c07e

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/shaderc-chromium-autoroll
Please CC radial-bots+chrome-roll@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: radial-bots+chrome-roll@google.com
Change-Id: I54b4331606642d000c9e2dbd9ed22ecf9fca2fde
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1933895Reviewed-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@{#718836}

DEPS

@@ -299,7 +299,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.
-  'shaderc_revision': 'da52fae116b3968baa4996e86a05aa45ec1f06ec',
+  'shaderc_revision': 'ff260580c07e8f9eae471b3d02dd2fe589c73198',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.