Roll src/third_party/skia/ 593192299..8e8eda9d4 (2 commits).

https://chromium.googlesource.com/skia.git/+log/5931922997b8..8e8eda9d4d2e

$ git log 593192299..8e8eda9d4 --date=short --no-merges --format='%ad %ae %s'
2015-11-23 msarett Switch Skia's libjpeg-turbo to 1.4.2
2015-11-23 kkinnunen Fix GLInterfaceValidation test after "Remove GrContextFactory::getGLContext"

CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel
TBR=jvanverth@google.com

Review URL: https://codereview.chromium.org/1470953002

Cr-Commit-Position: refs/heads/master@{#361112}

DEPS

@@ -39,7 +39,7 @@ 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': '5931922997b8904b1243240120014c016064b9fa',
+  'skia_revision': '8e8eda9d4d2e6e65e3339eaaaf8144a4ef6c721c',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.