Add plumbing in blink to allow overriding the skia font manager.

skia/config/sk_ref_cnt_ext_release.h

Index: skia/config/sk_ref_cnt_ext_release.h
diff --git a/skia/config/sk_ref_cnt_ext_release.h b/skia/config/sk_ref_cnt_ext_release.h
index 7736c84cf7e1d4280a260f410a7864e7d4053d95..6e274c5d05d8b6b70910fe8da8372cb717a5db9a 100644
--- a/skia/config/sk_ref_cnt_ext_release.h
+++ b/skia/config/sk_ref_cnt_ext_release.h
@@ -15,5 +15,10 @@ public:
   void deref() const { SkRefCntBase::unref(); }
 };
 
+namespace WTF {
+  inline void adopted(const SkRefCnt* object) {}
+  inline void requireAdoption(const SkRefCnt* object) {}
+};
+
 #endif