Add support for logging package name.

The functionality already exists in Java, add it to the C++ class too.

Bug: 77517571
Test: m
Test: Exercised by ag/3984344 in art
Change-Id: Id27a6c506783a02e4334498dadf55167efab097f
diff --git a/libmetricslogger/metrics_logger.cpp b/libmetricslogger/metrics_logger.cpp
index 912fa12..6a32153 100644
--- a/libmetricslogger/metrics_logger.cpp
+++ b/libmetricslogger/metrics_logger.cpp
@@ -62,6 +62,10 @@
     logger << LOGBUILDER_CATEGORY << category;
 }
 
+void ComplexEventLogger::SetPackageName(const std::string& package_name) {
+    logger << LOGBUILDER_PACKAGENAME << package_name;
+}
+
 void ComplexEventLogger::AddTaggedData(int tag, int32_t value) {
     logger << tag << value;
 }