snapshot: Add a minimal ModuleSnapshotMinidump and accessor from ProcessSnapshotMinidump

snapshot/mac/module_snapshot_mac.cc

 // 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 118 matching lines @@
       return kModuleTypeUnknown;
   }
 }
 
 void ModuleSnapshotMac::UUID(crashpad::UUID* uuid) const {
   INITIALIZATION_STATE_DCHECK_VALID(initialized_);
   return mach_o_image_reader_->UUID(uuid);
 }
 
 std::vector<std::string> ModuleSnapshotMac::AnnotationsVector() const {
+  INITIALIZATION_STATE_DCHECK_VALID(initialized_);
   MachOImageAnnotationsReader annotations_reader(
       process_reader_, mach_o_image_reader_, name_);
   return annotations_reader.Vector();
 }
 
 std::map<std::string, std::string> ModuleSnapshotMac::AnnotationsSimpleMap()
     const {
+  INITIALIZATION_STATE_DCHECK_VALID(initialized_);
   MachOImageAnnotationsReader annotations_reader(
       process_reader_, mach_o_image_reader_, name_);
   return annotations_reader.SimpleMap();
 }
 
 }  // namespace internal
 }  // namespace crashpad