Carry the client ID from the database all the way through upload

snapshot/mac/process_snapshot_mac.cc

Index: snapshot/mac/process_snapshot_mac.cc
diff --git a/snapshot/mac/process_snapshot_mac.cc b/snapshot/mac/process_snapshot_mac.cc
index bb11526706551b0fc7b41a670b5cd04899bd2cb2..a1ddecfc2b6d0efcfc456a503653e8e448f03153 100644
--- a/snapshot/mac/process_snapshot_mac.cc
+++ b/snapshot/mac/process_snapshot_mac.cc
@@ -23,6 +23,7 @@ ProcessSnapshotMac::ProcessSnapshotMac()
       modules_(),
       exception_(),
       process_reader_(),
+      client_id_(),
       annotations_simple_map_(),
       snapshot_time_(),
       initialized_() {
@@ -105,6 +106,11 @@ void ProcessSnapshotMac::ProcessCPUTimes(timeval* user_time,
   process_reader_.CPUTimes(user_time, system_time);
 }
 
+void ProcessSnapshotMac::ClientID(UUID* client_id) const {
+  INITIALIZATION_STATE_DCHECK_VALID(initialized_);
+  *client_id = client_id_;
+}
+
 const std::map<std::string, std::string>&
 ProcessSnapshotMac::AnnotationsSimpleMap() const {
   INITIALIZATION_STATE_DCHECK_VALID(initialized_);