Roll src/third_party/skia 1540b3ba37cf..b42af2f2cc97 (11 commits)

https://skia.googlesource.com/skia.git/+log/1540b3ba37cf..b42af2f2cc97


git log 1540b3ba37cf..b42af2f2cc97 --date=short --no-merges --format='%ad %ae %s'
2019-07-09 bsalomon@google.com vk_format_to_pixel_config behind GR_TEST_UTILS
2019-07-09 halcanary@google.com ModifierKey unifies sk_app::Window::ModifierKey & Sample::Click::ModifierKey
2019-07-09 brianosman@google.com Reland "Make the SkSL interpreter opt-in"
2019-07-09 jvanverth@google.com Re-enable Vulkan MSAA support in Viewer
2019-07-09 bsalomon@google.com Use vkCmdClearColorImage to clear backend textures
2019-07-09 reed@google.com create outer forloop to support loops=-1
2019-07-09 fmalita@chromium.org [skottie] Motion blur fast path
2019-07-09 egdaniel@google.com Move uses of functions taking SkColorType to GrColorType versions in GrCaps.
2019-07-09 fmalita@chromium.org [skottie] Motion blur support
2019-07-09 brianosman@google.com Revert "Enable MSAA on Gen8 Intel GPUs"
2019-07-09 scroggo@google.com Check for uninitialized memory during jpeg encode


Created with:
  gclient setdep -r src/third_party/skia@b42af2f2cc97

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

BUG=chromium:951893
TBR=fmalita@google.com

Change-Id: I0fe3bfef1f16899ba02fad4a24dfd4083cddbc69
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1693091Reviewed-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@{#675744}

DEPS

@@ -142,7 +142,7 @@ 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': '1540b3ba37cfc881f3df98950abd81cf502a312b',
+  'skia_revision': 'b42af2f2cc97441db0dd912825cd69edab5da179',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.