Roll src/third_party/skia/ c432b0ca8..312f4b24f (6 commits)

https://skia.googlesource.com/skia.git/+log/c432b0ca8a50..312f4b24f96f

$ git log c432b0ca8..312f4b24f --date=short --no-merges --format='%ad %ae %s'
2017-07-18 rmistry Copy over private SKPs during SKP asset create command
2017-07-18 halcanary SkPDF: Re-use Jpeg Image Shaders
2017-07-18 ethannicholas sksl now sees vulkan caps
2017-07-18 jvanverth Add some convexity checks to shadow code.
2017-07-18 mtklein start on raster pipeline 2d mode
2017-07-18 csmartdalton vk: Fix geometry-shader input varying locations

Created with:
  roll-dep src/third_party/skia


Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, see:
http://www.chromium.org/developers/tree-sheriffs/sheriff-details-chromium#TOC-Failures-due-to-DEPS-rolls


CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel;master.tryserver.chromium.android:android_optional_gpu_tests_rel
TBR=caryclark@chromium.org

Change-Id: I4eada1f195c6b4360f99205c87a835834e768ce7
Reviewed-on: https://chromium-review.googlesource.com/576361Reviewed-by: Skia Deps Roller <skia-deps-roller@chromium.org>
Commit-Queue: Skia Deps Roller <skia-deps-roller@chromium.org>
Cr-Commit-Position: refs/heads/master@{#487617}

DEPS

@@ -40,7 +40,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling Skia
   # and whatever else without interference from each other.
-  'skia_revision': 'c432b0ca8a5022d86f0ccf2efd1064ed9fce2e53',
+  'skia_revision': '312f4b24f96ff8c3f2bdb040b8167c09765992e4',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.