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

snapshot/minidump/process_snapshot_minidump.h

 // 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,
@@ skipping 52 matching lines @@
   void ProcessCPUTimes(timeval* user_time, timeval* system_time) const override;
   void ReportID(UUID* report_id) const override;
   void ClientID(UUID* client_id) const override;
   const std::map<std::string, std::string>& AnnotationsSimpleMap()
       const override;
   const SystemSnapshot* System() const override;
   std::vector<const ThreadSnapshot*> Threads() const override;
   std::vector<const ModuleSnapshot*> Modules() const override;
   const ExceptionSnapshot* Exception() const override;
   std::vector<const MemoryMapRegionSnapshot*> MemoryMap() const override;
+  std::vector<HandleSnapshot> Handles() const override;
   std::vector<const MemorySnapshot*> ExtraMemory() const override;
 
  private:
   // Initializes data carried in a MinidumpCrashpadInfo stream on behalf of
   // Initialize().
   bool InitializeCrashpadInfo();
 
   // Initializes data carried in a MINIDUMP_MODULE_LIST stream on behalf of
   // Initialize().
   bool InitializeModules();
@@ skipping 13 matching lines @@
   std::map<std::string, std::string> annotations_simple_map_;
   FileReaderInterface* file_reader_;  // weak
   InitializationStateDcheck initialized_;
 
   DISALLOW_COPY_AND_ASSIGN(ProcessSnapshotMinidump);
 };
 
 }  // namespace crashpad
 
 #endif  // CRASHPAD_SNAPSHOT_MINIDUMP_PROCESS_SNAPSHOT_MINIDUMP_H_