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

snapshot/snapshot.gyp

 # 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,
@@ skipping 49 matching lines @@
         'mac/process_types/dyld_images.proctype',
         'mac/process_types/flavors.h',
         'mac/process_types/internal.h',
         'mac/process_types/loader.proctype',
         'mac/process_types/nlist.proctype',
         'mac/process_types/traits.h',
         'mac/system_snapshot_mac.cc',
         'mac/system_snapshot_mac.h',
         'mac/thread_snapshot_mac.cc',
         'mac/thread_snapshot_mac.h',
+        'minidump/minidump_simple_string_dictionary_reader.cc',
+        'minidump/minidump_simple_string_dictionary_reader.h',
+        'minidump/minidump_string_reader.cc',
+        'minidump/minidump_string_reader.h',
+        'minidump/process_snapshot_minidump.cc',
+        'minidump/process_snapshot_minidump.h',
         'memory_snapshot.h',
         'module_snapshot.h',
         'process_snapshot.h',
         'system_snapshot.h',
         'thread_snapshot.h',
       ],
     },
     {
       'target_name': 'snapshot_test_lib',
       'type': 'static_library',
@@ skipping 41 matching lines @@
       ],
       'sources': [
         'cpu_context_test.cc',
         'mac/cpu_context_mac_test.cc',
         'mac/mach_o_image_annotations_reader_test.cc',
         'mac/mach_o_image_reader_test.cc',
         'mac/mach_o_image_segment_reader_test.cc',
         'mac/process_reader_test.cc',
         'mac/process_types_test.cc',
         'mac/system_snapshot_mac_test.cc',
+        'minidump/process_snapshot_minidump_test.cc',
       ],
     },
   ],
 }