Add MinidumpRVAListWriter and test

minidump/test/minidump_rva_list_test_util.h

Index: minidump/test/minidump_rva_list_test_util.h
diff --git a/minidump/test/minidump_rva_list_test_util.h b/minidump/test/minidump_rva_list_test_util.h
new file mode 100644
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+++ b/minidump/test/minidump_rva_list_test_util.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_MINIDUMP_TEST_MINIDUMP_RVA_LIST_TEST_UTIL_H_
+#define CRASHPAD_MINIDUMP_TEST_MINIDUMP_RVA_LIST_TEST_UTIL_H_
+
+#include <sys/types.h>
+
+#include <string>
+
+namespace crashpad {
+
+struct MinidumpRVAList;
+
+namespace test {
+
+//! \brief Returns the MinidumpRVAList at the start of a minidump file.
+//!
+//! \param[in] file_contents The contents of the minidump file.
+//! \param[in] count The number of ::RVA objects expected in the
+//!     MinidumpRVAList. This function will only be successful if exactly this
+//!     many objects are present, and if space for them exists in \a
+//!     file_contents.
+//!
+//! \return On success, the MinidumpRVAList at the beginning of the file. On
+//!     failure, raises a gtest assertion and returns `nullptr`.
+const MinidumpRVAList* MinidumpRVAListAtStart(const std::string& file_contents,
+                                              size_t count);
+
+}  // namespace test
+}  // namespace crashpad
+
+#endif  // CRASHPAD_MINIDUMP_TEST_MINIDUMP_RVA_LIST_TEST_UTIL_H_