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diff --git a/gfx/angle/checkout/src/common/apple_platform_utils.h b/gfx/angle/checkout/src/common/apple_platform_utils.h
new file mode 100644
index 0000000000..da932a9207
--- /dev/null
+++ b/gfx/angle/checkout/src/common/apple_platform_utils.h
@@ -0,0 +1,90 @@
+//
+// Copyright 2019 The ANGLE Project Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+
+// apple_platform_utils.h: Common utilities for Apple platforms.
+
+#ifndef COMMON_APPLE_PLATFORM_UTILS_H_
+#define COMMON_APPLE_PLATFORM_UTILS_H_
+
+#include "common/platform.h"
+
+// These are macros for substitution of Apple specific directive @available:
+
+// TARGET_OS_MACCATALYST only available in MacSDK 10.15
+
+#if TARGET_OS_MACCATALYST
+// ANGLE_APPLE_AVAILABLE_XCI: check if either of the 3 platforms (OSX/Catalyst/iOS) min verions is
+// available:
+#    define ANGLE_APPLE_AVAILABLE_XCI(macVer, macCatalystVer, iOSVer) \
+        @available(macOS macVer, macCatalyst macCatalystVer, iOS iOSVer, *)
+// ANGLE_APPLE_AVAILABLE_XC: check if either of the 2 platforms (OSX/Catalyst) min verions is
+// available:
+#    define ANGLE_APPLE_AVAILABLE_XC(macVer, macCatalystVer) \
+        @available(macOS macVer, macCatalyst macCatalystVer, *)
+// ANGLE_APPLE_AVAILABLE_CI: check if either of the 2 platforms (Catalyst/iOS) min verions is
+// available:
+#    define ANGLE_APPLE_AVAILABLE_CI(macCatalystVer, iOSVer) \
+        @available(macCatalyst macCatalystVer, iOS iOSVer, *)
+#else
+#    define ANGLE_APPLE_AVAILABLE_XCI(macVer, macCatalystVer, iOSVer) \
+        ANGLE_APPLE_AVAILABLE_XI(macVer, iOSVer)
+
+#    define ANGLE_APPLE_AVAILABLE_XC(macVer, macCatalystVer) @available(macOS macVer, *)
+#    define ANGLE_APPLE_AVAILABLE_CI(macCatalystVer, iOSVer) @available(iOS iOSVer, tvOS iOSVer, *)
+#endif
+
+// ANGLE_APPLE_AVAILABLE_XI: check if either of the 2 platforms (OSX/iOS) min verions is available:
+#define ANGLE_APPLE_AVAILABLE_XI(macVer, iOSVer) \
+    @available(macOS macVer, iOS iOSVer, tvOS iOSVer, *)
+
+// ANGLE_APPLE_AVAILABLE_I: check if a particular iOS version is available
+#define ANGLE_APPLE_AVAILABLE_I(iOSVer) @available(iOS iOSVer, tvOS iOSVer, *)
+
+#if TARGET_OS_IPHONE
+#    if !defined(__IPHONE_11_0)
+#        define __IPHONE_11_0 110000
+#    endif
+#    if !defined(ANGLE_IOS_DEPLOY_TARGET)
+#        define ANGLE_IOS_DEPLOY_TARGET __IPHONE_11_0
+#    endif
+#    if !defined(__IPHONE_OS_VERSION_MAX_ALLOWED)
+#        define __IPHONE_OS_VERSION_MAX_ALLOWED __IPHONE_11_0
+#    endif
+#    if !defined(__TV_OS_VERSION_MAX_ALLOWED)
+#        define __TV_OS_VERSION_MAX_ALLOWED __IPHONE_11_0
+#    endif
+#endif
+
+#if !defined(TARGET_OS_MACCATALYST)
+#    define TARGET_OS_MACCATALYST 0
+#endif
+
+#if defined(__ARM_ARCH)
+#    define ANGLE_APPLE_IS_ARM (__ARM_ARCH != 0)
+#else
+#    define ANGLE_APPLE_IS_ARM 0
+#endif
+
+#define ANGLE_APPLE_OBJC_SCOPE @autoreleasepool
+
+#if !__has_feature(objc_arc)
+#    define ANGLE_APPLE_AUTORELEASE autorelease
+#    define ANGLE_APPLE_RETAIN retain
+#    define ANGLE_APPLE_RELEASE release
+#else
+#    define ANGLE_APPLE_AUTORELEASE self
+#    define ANGLE_APPLE_RETAIN self
+#    define ANGLE_APPLE_RELEASE self
+#endif
+
+#define ANGLE_APPLE_UNUSED __attribute__((unused))
+
+namespace angle
+{
+bool IsMetalRendererAvailable();
+}
+
+#endif