Roll src/third_party/skia 7a13b461e6e0..1803f4ef6fe7 (21 commits)

https://skia.googlesource.com/skia.git/+log/7a13b461e6e0..1803f4ef6fe7

git log 7a13b461e6e0..1803f4ef6fe7 --date=short --no-merges --format='%ad %ae %s'
2019-11-05 bungeman@google.com Revert "Fix empty run handling in trivial shaper iterators"
2019-11-05 robertphillips@google.com Revert "Reland "Implement sample mask and sample locations support in Vulkan""
2019-11-05 robertphillips@google.com Revert "Add a "conservative raster" flag to GrPipeline and implement in Vulkan"
2019-11-05 bungeman@google.com Fix empty run handling in trivial shaper iterators
2019-11-05 fmalita@chromium.org [skottie] Streamlined gradient stop merger
2019-11-05 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com Roll recipe dependencies (trivial).
2019-11-05 mtklein@google.com implement SkColorFilterShader::isOpaque()
2019-11-05 csmartdalton@google.com Add a "conservative raster" flag to GrPipeline and implement in Vulkan
2019-11-05 egdaniel@google.com Add new macro for checking device lost when making Vulkan calls.
2019-11-05 borenet@google.com [recipes] CanvasKit, PathKit, some others don't need bot_update
2019-11-05 ethannicholas@google.com Reland "Implement sample mask and sample locations support in Vulkan"
2019-11-05 mtklein@google.com unify program() and uniforms()
2019-11-05 brianosman@google.com Reland "Fully embrace skcms types in SkColorSpace API"
2019-11-05 bsalomon@google.com Cleanup kGray_8 readback.
2019-11-05 fmalita@chromium.org [skottie] Fix trim path mode interpretation
2019-11-05 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/angle2 6c7208f93d6e..67527cb45293 (10 commits)
2019-11-05 fmalita@chromium.org [skottie] Use SkColor4f for gradient color stops
2019-11-05 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com Roll recipe dependencies (trivial).
2019-11-05 benjaminwagner@google.com Fail Skpbench on unsupported hardware
2019-11-05 herb@google.com Speed up diff canvas using small bit vector
2019-11-05 mtklein@google.com add color filter support

Created with:
  gclient setdep -r src/third_party/skia@1803f4ef6fe7

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/skia-autoroll
Please CC ethannicholas@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=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=ethannicholas@google.com

Bug: chromium:None
Change-Id: Ic218823881780ad07ce18c4aae79b9c15a20c924
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1900120Reviewed-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@{#712784}

DEPS

@@ -172,7 +172,7 @@ 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': '7a13b461e6e08eaea9dea2a90ca4724e9c1979eb',
+  'skia_revision': '1803f4ef6fe7c45656d4cb83661434f2a2371384',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.