Add MachOImageReader and its test

util/test/mac/dyld.h

Index: util/test/mac/dyld.h
diff --git a/util/test/mac/dyld.h b/util/test/mac/dyld.h
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+// Copyright 2014 The Crashpad Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef CRASHPAD_UTIL_TEST_MAC_DYLD_H_
+#define CRASHPAD_UTIL_TEST_MAC_DYLD_H_
+
+#include <mach-o/dyld_images.h>
+
+extern "C" {
+
+// Returns a pointer to this process’ dyld_all_image_infos structure. This is
+// implemented as a non-public dyld API, declared in 10.9.2
+// dyld-239.4/include/mach-o/dyld_priv.h.
+const dyld_all_image_infos* _dyld_get_all_image_infos();
+
+}  // extern "C"
+
+#endif  // CRASHPAD_UTIL_TEST_MAC_DYLD_H_