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diff --git a/toolkit/crashreporter/google-breakpad/src/tools/windows/converter_exe/escaping.h b/toolkit/crashreporter/google-breakpad/src/tools/windows/converter_exe/escaping.h
new file mode 100644
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+++ b/toolkit/crashreporter/google-breakpad/src/tools/windows/converter_exe/escaping.h
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+// Copyright 2019 Google Inc. All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Base64 escaping methods to encode/decode strings.
+
+#ifndef TOOLS_WINDOWS_CONVERTER_EXE_ESCAPING_H_
+#define TOOLS_WINDOWS_CONVERTER_EXE_ESCAPING_H_
+
+#include <string>
+
+namespace strings {
+
+using std::string;
+
+// ----------------------------------------------------------------------
+// Base64Escape()
+// WebSafeBase64Escape()
+//    Encode "src" to "dest" using base64 encoding.
+//    src is not null terminated, instead specify len.
+//    'dest' should have at least CalculateBase64EscapedLen() length.
+//    RETURNS the length of dest.
+//    The WebSafe variation use '-' instead of '+' and '_' instead of '/'
+//    so that we can place the out in the URL or cookies without having
+//    to escape them.  It also has an extra parameter "do_padding",
+//    which when set to false will prevent padding with "=".
+// ----------------------------------------------------------------------
+void Base64Escape(const string& src, string* dest);
+int Base64Escape(const unsigned char* src, int slen, char* dest, int szdest);
+// Encode src into dest with padding.
+void Base64Escape(const unsigned char* src, int szsrc,
+                  string* dest, bool do_padding);
+
+int WebSafeBase64Escape(const unsigned char* src, int slen, char* dest,
+                        int szdest, bool do_padding);
+// Encode src into dest web-safely without padding.
+void WebSafeBase64Escape(const string& src, string* dest);
+// Encode src into dest web-safely with padding.
+void WebSafeBase64EscapeWithPadding(const string& src, string* dest);
+void WebSafeBase64Escape(const unsigned char* src, int szsrc,
+                         string* dest, bool do_padding);
+
+// ----------------------------------------------------------------------
+// Base64Unescape()
+// WebSafeBase64Unescape()
+//    Copies "src" to "dest", where src is in base64 and is written to its
+//    ASCII equivalents. src is not null terminated, instead specify len.
+//    I recommend that slen<szdest, but we honor szdest anyway.
+//    RETURNS the length of dest, or -1 if src contains invalid chars.
+//    The WebSafe variation use '-' instead of '+' and '_' instead of '/'.
+//    The variations that store into a string clear the string first, and
+//    return false (with dest empty) if src contains invalid chars; for
+//    these versions src and dest must be different strings.
+// ----------------------------------------------------------------------
+int Base64Unescape(const char* src, int slen, char* dest, int szdest);
+bool Base64Unescape(const char* src, int slen, string* dest);
+inline bool Base64Unescape(const string& src, string* dest) {
+  return Base64Unescape(src.data(), src.size(), dest);
+}
+
+
+int WebSafeBase64Unescape(const char* src, int slen, char* dest, int szdest);
+bool WebSafeBase64Unescape(const char* src, int slen, string* dest);
+bool WebSafeBase64Unescape(const string& src, string* dest);
+
+// Return the length to use for the output buffer given to the base64 escape
+// routines. Make sure to use the same value for do_padding in both.
+// This function may return incorrect results if given input_len values that
+// are extremely high, which should happen rarely.
+int CalculateBase64EscapedLen(int input_len, bool do_padding);
+// Use this version when calling Base64Escape without a do_padding arg.
+int CalculateBase64EscapedLen(int input_len);
+}  // namespace strings
+
+#endif  // TOOLS_WINDOWS_CONVERTER_EXE_ESCAPING_H_