Add third_party/apple_apsl from https://crrev.com/328418

third_party/apple_apsl/CFRuntime.h

Index: third_party/apple_apsl/CFRuntime.h
diff --git a/third_party/apple_apsl/CFRuntime.h b/third_party/apple_apsl/CFRuntime.h
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+/*
+ * Copyright (c) 2009 Apple Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ * 
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ * 
+ * @APPLE_LICENSE_HEADER_END@
+ */
+/*	CFRuntime.h
+	Copyright (c) 1999-2009, Apple Inc. All rights reserved.
+*/
+
+#ifndef THIRD_PARTY_APPLE_APSL_CFRUNTIME_H_
+#define THIRD_PARTY_APPLE_APSL_CFRUNTIME_H_
+
+/* All CF "instances" start with this structure.  Never refer to
+ * these fields directly -- they are for CF's use and may be added
+ * to or removed or change format without warning.  Binary
+ * compatibility for uses of this struct is not guaranteed from
+ * release to release.
+ */
+typedef struct __ChromeCFRuntimeBase {
+    uintptr_t _cfisa;
+    uint8_t _cfinfo[4];
+#if __LP64__
+    uint32_t _rc;
+#endif
+} ChromeCFRuntimeBase;
+
+#endif  // THIRD_PARTY_APPLE_APSL_CFRUNTIME_H_