Spin off just SkLazyFnPtr from 305513002.

src/core/SkThreadPriv.h

Index: src/core/SkThreadPriv.h
diff --git a/src/core/SkThreadPriv.h b/src/core/SkThreadPriv.h
new file mode 100644
index 0000000000000000000000000000000000000000..a9729216064ab25d35092310e96e73dd3791eef3
--- /dev/null
+++ b/src/core/SkThreadPriv.h
@@ -0,0 +1,23 @@
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkThreadPriv_DEFINED
+#define SkThreadPriv_DEFINED
+
+#include "SkTypes.h"
+
+// SK_ATOMICS_PLATFORM_H must provide inline implementations for the following declarations.
+
+/** Atomic compare and set, for pointers.
+ *  If *addr == before, set *addr to after.  Always returns previous value of *addr.
+ *  This must act as a compiler barrier.
+ */
+static void* sk_atomic_cas(void** addr, void* before, void* after);
+
+#include SK_ATOMICS_PLATFORM_H
+
+#endif//SkThreadPriv_DEFINED