Roll src/third_party/skia/ 97c110860..ef4f7b4dc (12 commits)

https://skia.googlesource.com/skia.git/+log/97c110860758..ef4f7b4dc1e4

$ git log 97c110860..ef4f7b4dc --date=short --no-merges --format='%ad %ae %s'
2018-05-09 robertphillips Revert "Fix clipping of SkMatrixImageFilter input"
2018-05-09 reed rewrite while to for loop to avoid last increment
2018-05-09 reed check for focaldata failure
2018-05-09 reed make sure we don't set level-of-detail to zero
2018-05-09 csmartdalton ccpr: Clean up GrCoverageCountingPathRenderer
2018-05-09 bsalomon Approximate conics as quads in GrAAHairlinePathRenderer when fp32 not supported
2018-05-09 bungeman complexclip gm to clip when saving layer with bounds.
2018-05-09 halcanary Revert "Revert "SkAdvancedTypefaceMetrics: factor out GlyphToUnicode""
2018-05-08 brianosman Add fPreferExternalImagesOverES3 to GrContextOptions
2018-05-09 robertphillips Fix clipping of SkMatrixImageFilter input
2018-05-09 fmalita [skottie] Json cleanup pass
2018-05-09 bungeman Remove SK_IGNORE_MASK_FILTER_GLYPH_FIX.

Created with:
  roll-dep src/third_party/skia


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

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=master.tryserver.blink:linux_trusty_blink_rel;luci.chromium.try:android_optional_gpu_tests_rel;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=egdaniel@chromium.org

Change-Id: I01c010bf92cf5dae30e90545dc9e41c6c1c42e1b
Reviewed-on: https://chromium-review.googlesource.com/1052817Reviewed-by: skia-chromium-autoroll <skia-chromium-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com>
Commit-Queue: skia-chromium-autoroll <skia-chromium-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#557338}

DEPS

@@ -96,7 +96,7 @@ 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': '97c1108607584b6050a6880d6ce22846e4913a92',
+  'skia_revision': 'ef4f7b4dc1e4c315dab7bd387627cfb9e04bcefd',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.