Upstream utilities for iOS

ios/chrome/browser/arch_util.h

Index: ios/chrome/browser/arch_util.h
diff --git a/ios/chrome/browser/arch_util.h b/ios/chrome/browser/arch_util.h
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+// Copyright 2014 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 IOS_CHROME_BROWSER_ARCH_UTIL_H_
+#define IOS_CHROME_BROWSER_ARCH_UTIL_H_
+
+namespace arch_util {
+
+// Architecture of the currently running binary. Depends on the combination of
+// app binary archs and device's arch. e.g. for arm7/arm64 fat binary running
+// on 64-bit processor the value will be "arm64", but for the same fat binary
+// running on 32-bit processor the value will be "arm".
+extern const char kCurrentArch[];
+
+// Constant for 32-bit ARM architecture.
+extern const char kARMArch[];
+
+// Constant for 64-bit ARM architecture.
+extern const char kARM64Arch[];
+
+}  // namespace arch_util
+
+#endif  // IOS_CHROME_BROWSER_ARCH_UTIL_H_