Roll src/third_party/skia/ 39f7a10a0..54682e856 (1 commit).

https://chromium.googlesource.com/skia.git/+log/39f7a10a04a9..54682e856cb6

$ git log 39f7a10a0..54682e856 --date=short --no-merges --format='%ad %ae %s'
2016-09-02 msarett Delete SkColorSpace::kUnknown_Named, remove fNamed field

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

Review-Url: https://codereview.chromium.org/2307183002
Cr-Commit-Position: refs/heads/master@{#416414}

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': '39f7a10a04a914384944d8bf62621144ac4eeaa3',
+  'skia_revision': '54682e856cb66c653bc7e253981a421a2618398e',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.