Roll src/third_party/skia/ cb88470d8..ec77963bf (10 commits)

https://skia.googlesource.com/skia.git/+log/cb88470d82d6..ec77963bf32e

$ git log cb88470d8..ec77963bf --date=short --no-merges --format='%ad %ae %s'
2018-03-19 angle-skia-autoroll Roll skia/third_party/externals/angle2/ 3761dc7bf..daedf4d23 (3 commits)
2018-03-19 liyuqian Make consistent isRadiusIncreasing decision
2018-03-19 caryclark remove imageinfo flatten altogether
2018-03-19 bsalomon Revert "Revert "New read pixels implementation that is simpler but does all conversions on CPU.""
2018-03-19 bsalomon Remove deprecated versions of YUV texture SkImage factories
2018-03-19 ericrk Allow SkTraceMemoryDump to exclude wrapped objects
2018-03-19 hcm Fix go syntax for Debian compile
2018-03-19 bsalomon Remove SkSurface::MakeFromBackendTexture variant that doesn't take SkColorType
2018-03-19 ethannicholas fix switch fallthrough warning
2018-03-19 liyuqian Fix concentric 2pt conical gradient in GPU where r1 < r0

Created with:
  roll-dep src/third_party/skia
BUG=chromium:795358


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:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
TBR=jvanverth@chromium.org

Change-Id: I83f77a4beed619b2bc27becaafe1224131abb3d1
Reviewed-on: https://chromium-review.googlesource.com/969800
Reviewed-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@{#544276}

DEPS

@@ -79,7 +79,7 @@ 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': 'cb88470d82d646972a7e83d04bb19444d87dd840',
+  'skia_revision': 'ec77963bf32eda185cb422d2166f60da094feade',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.