win: Implement exception snapshot

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 69 matching lines @@
         'minidump/minidump_string_reader.h',
         'minidump/module_snapshot_minidump.cc',
         'minidump/module_snapshot_minidump.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',
+        'win/cpu_context_win.cc',
+        'win/cpu_context_win.h',
+        'win/exception_snapshot_win.cc',
+        'win/exception_snapshot_win.h',
         'win/memory_snapshot_win.cc',
         'win/memory_snapshot_win.h',
         'win/module_snapshot_win.cc',
         'win/module_snapshot_win.h',
         'win/pe_image_annotations_reader.cc',
         'win/pe_image_annotations_reader.h',
         'win/pe_image_reader.cc',
         'win/pe_image_reader.h',
         'win/process_reader_win.cc',
         'win/process_reader_win.h',
@@ skipping 10 matching lines @@
             'libraries': [
               '-lpowrprof.lib',
               '-lversion.lib',
             ],
           },
         }],
       ]
     },
   ],
 }