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diff --git a/gfx/angle/checkout/src/common/string_utils.h b/gfx/angle/checkout/src/common/string_utils.h
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+++ b/gfx/angle/checkout/src/common/string_utils.h
@@ -0,0 +1,86 @@
+//
+// Copyright 2015 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.
+//
+// string_utils:
+//   String helper functions.
+//
+
+#ifndef LIBANGLE_STRING_UTILS_H_
+#define LIBANGLE_STRING_UTILS_H_
+
+#include <string>
+#include <vector>
+
+#include "common/Optional.h"
+
+namespace angle
+{
+
+extern const char kWhitespaceASCII[];
+
+enum WhitespaceHandling
+{
+    KEEP_WHITESPACE,
+    TRIM_WHITESPACE,
+};
+
+enum SplitResult
+{
+    SPLIT_WANT_ALL,
+    SPLIT_WANT_NONEMPTY,
+};
+
+std::vector<std::string> SplitString(const std::string &input,
+                                     const std::string &delimiters,
+                                     WhitespaceHandling whitespace,
+                                     SplitResult resultType);
+
+void SplitStringAlongWhitespace(const std::string &input, std::vector<std::string> *tokensOut);
+
+std::string TrimString(const std::string &input, const std::string &trimChars);
+
+// Return the substring starting at offset and up to the first occurance of the |delimeter|.
+std::string GetPrefix(const std::string &input, size_t offset, const char *delimiter);
+std::string GetPrefix(const std::string &input, size_t offset, char delimiter);
+
+bool HexStringToUInt(const std::string &input, unsigned int *uintOut);
+
+bool ReadFileToString(const std::string &path, std::string *stringOut);
+
+// Check if the string str begins with the given prefix.
+// The comparison is case sensitive.
+bool BeginsWith(const std::string &str, const std::string &prefix);
+
+// Check if the string str begins with the given prefix.
+// Prefix may not be NULL and needs to be NULL terminated.
+// The comparison is case sensitive.
+bool BeginsWith(const std::string &str, const char *prefix);
+
+// Check if the string str begins with the given prefix.
+// str and prefix may not be NULL and need to be NULL terminated.
+// The comparison is case sensitive.
+bool BeginsWith(const char *str, const char *prefix);
+
+// Check if the string str begins with the first prefixLength characters of the given prefix.
+// The length of the prefix string should be greater than or equal to prefixLength.
+// The comparison is case sensitive.
+bool BeginsWith(const std::string &str, const std::string &prefix, const size_t prefixLength);
+
+// Check if the string str ends with the given suffix.
+// Suffix may not be NUL and needs to be NULL terminated.
+// The comparison is case sensitive.
+bool EndsWith(const std::string &str, const char *suffix);
+
+// Convert to lower-case.
+void ToLower(std::string *str);
+
+// Replaces the substring 'substring' in 'str' with 'replacement'. Returns true if successful.
+bool ReplaceSubstring(std::string *str,
+                      const std::string &substring,
+                      const std::string &replacement);
+
+}  // namespace angle
+
+#endif  // LIBANGLE_STRING_UTILS_H_