Roll src/third_party/skia/ 7e872caaf..e32500f06 (4 commits)

https://skia.googlesource.com/skia.git/+log/7e872caaf618..e32500f0642d

$ git log 7e872caaf..e32500f06 --date=short --no-merges --format='%ad %ae %s'
2017-07-19 reed Assume HQ is handled by pipeline, delete legacy code-path
2017-07-19 brianosman Strip out unused tracing macros
2017-07-19 bsalomon Remove GrBackendTextureDesc
2017-07-19 halcanary SkPDF:  minor cleanups of skpdfdevice

Created with:
  roll-dep src/third_party/skia


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

If the roll is causing failures, see:
http://www.chromium.org/developers/tree-sheriffs/sheriff-details-chromium#TOC-Failures-due-to-DEPS-rolls


CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel;master.tryserver.chromium.android:android_optional_gpu_tests_rel
TBR=caryclark@chromium.org

Change-Id: Ie5ac9a80e2e2f267ce87a168a3e3d2b7dd985ad5
Reviewed-on: https://chromium-review.googlesource.com/578721Reviewed-by: Skia Deps Roller <skia-deps-roller@chromium.org>
Commit-Queue: Skia Deps Roller <skia-deps-roller@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488117}

DEPS

@@ -40,7 +40,7 @@ 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': '7e872caaf618c8c5fc376515143a3176e09bced2',
+  'skia_revision': 'e32500f0642df381fd79731df2f7a4a4a71a46e2',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.