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

skia/config/sk_ref_cnt_ext_release.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef SK_REF_CNT_EXT_RELEASE_H_
 #define SK_REF_CNT_EXT_RELEASE_H_
 
 #ifdef SK_REF_CNT_EXT_DEBUG_H_
 #error Only one SkRefCnt should be used.
 #endif
 
 // Alternate implementation of SkRefCnt for Chromium release builds
 class SK_API SkRefCnt : public SkRefCntBase {
 public:
   void deref() const { SkRefCntBase::unref(); }
 };
 
+namespace WTF {
+  inline void adopted(const SkRefCnt* object) {}
+  inline void requireAdoption(const SkRefCnt* object) {}
+};
+
 #endif