Roll skia 69544ec14..7c1eae5c9 (3 commits)

https://skia.googlesource.com/skia.git/+log/69544ec14..7c1eae5c9

2017-10-13 kjlubick@google.com Fix asset version detection
2017-10-13 bsalomon@google.com Implemenet onStealBackendTexture in GrMtlTexture
2017-10-13 reed@google.com remove dead code -- older than min picture version

Change-Id: I869c99845eb1665321b73b69e22cd478a16f0a9d
diff --git a/skia b/skia
index 40c93fe..1825110 100644
--- a/skia
+++ b/skia
@@ -24,7 +24,7 @@
     <project name="external/skia.googlesource.com/skia"
              path="third_party/skia"
              remote="https://skia.googlesource.com/skia"
-             revision="69544ec14b5a4ac5b5695860e2ecb77406ec1033"/>
+             revision="7c1eae5c904e7fe9ade7b53f563bb490831428ac"/>
     <project name="third_party/yasm"
              path="third_party/yasm"
              remote="https://fuchsia.googlesource.com/third_party/yasm"