Roll DEPS for skia to 3bf7509c.

TBR=caryclark@google.com

Review-Url: https://codereview.chromium.org/2287443002
diff --git a/DEPS b/DEPS
index 39c13a4..7e32009 100644
--- a/DEPS
+++ b/DEPS
@@ -15,7 +15,7 @@
   'gtest_revision': '8245545b6dc9c4703e6496d1efd19e975ad2b038',
   'icu_revision': '2341038bf72869a5683a893a2b319a48ffec7f62',
   'pdfium_tests_revision': 'afbac944ba4b41252e4bd16372f27806bc0ed924',
-  'skia_revision': '36c38cbb29744e0b5390a38367e47c0c74287c2d',
+  'skia_revision': '3bf7509c3f68aefbe5f8b2ea5888319a71a91d2d',
   'tools_memory_revision': '427f10475e1a8d72424c29d00bf689122b738e5d',
   'trace_event_revision': '54b8455be9505c2cb0cf5c26bb86739c236471aa',
   'v8_revision': '75f10f91b1b0b392d2a29a7a480bf079db6f43fa',