Roll src/third_party/skia b6a3a3b245a5..f23ff10eb270 (5 commits)

https://skia.googlesource.com/skia.git/+log/b6a3a3b245a5..f23ff10eb270


git log b6a3a3b245a5..f23ff10eb270 --date=short --no-merges --format='%ad %ae %s'
2019-04-01 bungeman@google.com Cache data stream for CG typefaces.
2019-04-01 bsalomon@google.com GrBackendTextureImageGenerator proxy callback uses unique key to find existing GrTexture.
2019-04-01 robertphillips@google.com Make prepareSurfaceForExternalIO always flush
2019-04-01 bsalomon@google.com Make GrVkGpuRTCommandBuffer::CommandBufferInfo hold textures by pending read.
2019-04-01 rmistry@google.com Remove 4 page sets that are not useful as SKPs


Created with:
  gclient setdep -r src/third_party/skia@f23ff10eb270

The AutoRoll server is located here: https://autoroll.skia.org/r/skia-autoroll

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

If the roll is causing failures, please contact the current sheriff, who should
be CC'd on the roll, and stop the roller if necessary.

CQ_INCLUDE_TRYBOTS=luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux-blink-rel;luci.chromium.try:linux-chromeos-compile-dbg;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
TBR=jlavrova@chromium.org

Change-Id: If7a8a4310e16dd8d8c6d0ee4cf1cc830dda096c9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1548092Reviewed-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@{#646474}

DEPS

@@ -129,7 +129,7 @@ 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': 'b6a3a3b245a5f97a2c1325278dab90193f69e9df',
+  'skia_revision': 'f23ff10eb270fe8563882a1bba4284f52191cd2c',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.