Roll src/third_party/skia/ fc5b70a8e..df4f47b8f (3 commits).

https://chromium.googlesource.com/skia.git/+log/fc5b70a8e427..df4f47b8ff63

$ git log fc5b70a8e..df4f47b8f --date=short --no-merges --format='%ad %ae %s'
2016-06-30 benjaminwagner Revert of Better encapsulate oval/rrect batchs. (patchset #4 id:60001 of https://codereview.chromium.org/2104423003/ )
2016-06-29 bsalomon Hide more GrBatch Geometry structs. GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2110903002
2016-06-29 bsalomon Better encapsulate oval/rrect batchs. GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2104423003

CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel;master.tryserver.chromium.android:android_arm64_dbg_recipe
TBR=benjaminwagner@google.com

Review-Url: https://codereview.chromium.org/2111893002
Cr-Commit-Position: refs/heads/master@{#403158}

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': 'fc5b70a8e427ee115868786fa361c2c813ab566b',
+  'skia_revision': 'df4f47b8ff6378c4d8f775dcb3169ac7c64f2510',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.