Enable reference adoption checks for Blink+skia in Debug builds.

skia/config/sk_ref_cnt_ext_release.h

Index: skia/config/sk_ref_cnt_ext_release.h
===================================================================
--- skia/config/sk_ref_cnt_ext_release.h	(revision 0)
+++ skia/config/sk_ref_cnt_ext_release.h	(working copy)
@@ -0,0 +1,19 @@
+// 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(); }
+};
+
+#endif
+