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

snapshot/process_snapshot.h

Index: snapshot/process_snapshot.h
diff --git a/snapshot/process_snapshot.h b/snapshot/process_snapshot.h
index 0a2f4f9fd4047ff57890e4de6ade4ef459022c38..19d34607bf22489716cfd0acc2dd2c644782bc11 100644
--- a/snapshot/process_snapshot.h
+++ b/snapshot/process_snapshot.h
@@ -22,6 +22,7 @@
 #include <string>
 #include <vector>
 
+#include "snapshot/handle_snapshot.h"
 #include "util/misc/uuid.h"
 
 namespace crashpad {
@@ -171,6 +172,12 @@ class ProcessSnapshot {
   //!     the ProcessSnapshot object that they were obtained from.
   virtual std::vector<const MemoryMapRegionSnapshot*> MemoryMap() const = 0;
 
+  //! \brief Returns HandleSnapshot objects reflecting the open handles in the
+  //!     snapshot process at the time of the snapshot.
+  //!
+  //! \return A vector of HandleSnapshot objects.
+  virtual std::vector<HandleSnapshot> Handles() const = 0;
+
   //! \brief Returns a vector of additional memory blocks that should be
   //!     included in a minidump.
   //!