Some plumbing for the beginning of getting handles into snapshot/minidump

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 18 matching lines @@
       'include_dirs': [
         '..',
       ],
       'sources': [
         'cpu_architecture.h',
         'cpu_context.cc',
         'cpu_context.h',
         'crashpad_info_client_options.cc',
         'crashpad_info_client_options.h',
         'exception_snapshot.h',
+        'handle_snapshot.cc',
+        'handle_snapshot.h',
         'mac/cpu_context_mac.cc',
         'mac/cpu_context_mac.h',
         'mac/exception_snapshot_mac.cc',
         'mac/exception_snapshot_mac.h',
         'mac/mach_o_image_annotations_reader.cc',
         'mac/mach_o_image_annotations_reader.h',
         'mac/mach_o_image_reader.cc',
         'mac/mach_o_image_reader.h',
         'mac/mach_o_image_segment_reader.cc',
         'mac/mach_o_image_segment_reader.h',
@@ skipping 67 matching lines @@
             'libraries': [
               '-lpowrprof.lib',
               '-lversion.lib',
             ],
           },
         }],
       ]
     },
   ],
 }