Roll src/third_party/skia/ 046cb56c6..c0444615e (7 commits).

https://chromium.googlesource.com/skia.git/+log/046cb56c6c1b..c0444615ed76

$ git log 046cb56c6..c0444615e --date=short --no-merges --format='%ad %ae %s'
2016-09-16 msarett Support Float32 output from SkColorSpaceXform
2016-09-16 mtklein Build with GN on CT bots.
2016-09-16 robertphillips Improve join between the two RRects in SkRRectsGaussianEdgeShader
2016-09-16 mtklein Promote the N5 to the CQ for real.
2016-09-16 rmistry Run SVGs through nanobench on all Perf bots.
2016-09-16 stani Clear stencil buffer before using it for drawing
2016-09-16 msarett Revert of Support Float32 output from SkColorSpaceXform (patchset #7 id:140001 of https://codereview.chromium.org/2339233003/ )

CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_precise_blink_rel
TBR=djsollen@google.com

Review-Url: https://codereview.chromium.org/2345873003
Cr-Commit-Position: refs/heads/master@{#419254}

DEPS

@@ -36,7 +36,7 @@ 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': '046cb56c6c1bb40779c81b115271ed0e8196b48b',
+  'skia_revision': 'c0444615ed76360f680619ad4d1f92cda6181a50',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.