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

snapshot/minidump/process_snapshot_minidump.cc

Index: snapshot/minidump/process_snapshot_minidump.cc
diff --git a/snapshot/minidump/process_snapshot_minidump.cc b/snapshot/minidump/process_snapshot_minidump.cc
index 2a3330f2b63c265e15bcf695cd22f11380fbe731..d5e229f8c6d601b95d95fd2164b5213f623de2c5 100644
--- a/snapshot/minidump/process_snapshot_minidump.cc
+++ b/snapshot/minidump/process_snapshot_minidump.cc
@@ -127,6 +127,11 @@ void ProcessSnapshotMinidump::ProcessCPUTimes(timeval* user_time,
   system_time->tv_usec = 0;
 }
 
+void ProcessSnapshotMinidump::ClientID(UUID* client_id) const {
+  INITIALIZATION_STATE_DCHECK_VALID(initialized_);
+  *client_id = crashpad_info_.client_id;
+}
+
 const std::map<std::string, std::string>&
 ProcessSnapshotMinidump::AnnotationsSimpleMap() const {
   // TODO(mark): This method should not be const, although the interface