Add ProcessSnapshotMinidump, the beginning of the minidump variant of the Snapshot family

snapshot/minidump/minidump_simple_string_dictionary_reader.h

Index: snapshot/minidump/minidump_simple_string_dictionary_reader.h
diff --git a/snapshot/minidump/minidump_simple_string_dictionary_reader.h b/snapshot/minidump/minidump_simple_string_dictionary_reader.h
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index 0000000000000000000000000000000000000000..65b7cba8dcadf158ac971f68ea934a5931016222
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+++ b/snapshot/minidump/minidump_simple_string_dictionary_reader.h
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+// Copyright 2015 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_SNAPSHOT_MINIDUMP_MINIDUMP_SIMPLE_STRING_DICTIONARY_READER_H_
+#define CRASHPAD_SNAPSHOT_MINIDUMP_MINIDUMP_SIMPLE_STRING_DICTIONARY_READER_H_
+
+#include <windows.h>
+#include <dbghelp.h>
+
+#include <map>
+#include <string>
+
+#include "util/file/file_reader.h"
+
+namespace crashpad {
+namespace internal {
+
+//! \brief Reads a MinidumpSimpleStringDictionary from a minidump file \a
+//!     location in \a file_reader, and returns it in \a dictionary.
+//!
+//! \return `true` on success, with \a dictionary set by replacing its contents.
+//!     `false` on failure, with a message logged. If any individual strings
+//!     cannot be read, or if any duplicate keys are found, it is not considered
+//!     an error, although a message will be logged.
+bool ReadMinidumpSimpleStringDictionary(
+    FileReaderInterface* file_reader,
+    const MINIDUMP_LOCATION_DESCRIPTOR& location,
+    std::map<std::string, std::string>* dictionary);
+
+}  // namespace internal
+}  // namespace crashpad
+
+#endif  // CRASHPAD_SNAPSHOT_MINIDUMP_MINIDUMP_SIMPLE_STRING_DICTIONARY_READER_H_