Add MinidumpModuleWriter, MinidumpModuleListWriter, related classes, and their test

minidump/minidump_extensions.cc

Index: minidump/minidump_extensions.cc
diff --git a/minidump/minidump_extensions.cc b/minidump/minidump_extensions.cc
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+++ b/minidump/minidump_extensions.cc
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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.
+
+#include "minidump/minidump_extensions.h"
+
+namespace crashpad {
+
+const uint32_t MinidumpModuleCodeViewRecordPDB20::kSignature;
+const uint32_t MinidumpModuleCodeViewRecordPDB70::kSignature;
+
+}  // namespace crashpad