[libstdc++-trusty] Support std::chrono

Bug: 141189390
Change-Id: Iafbcc963e2c2109f8d4ac5defb4e5490e596481c
diff --git a/lib/libstdc++-trusty/rules.mk b/lib/libstdc++-trusty/rules.mk
index bb9e9f7..f721244 100644
--- a/lib/libstdc++-trusty/rules.mk
+++ b/lib/libstdc++-trusty/rules.mk
@@ -27,6 +27,7 @@
         $(LIBCXX_DIR)/src/any.cpp \
         $(LIBCXX_DIR)/src/bind.cpp \
         $(LIBCXX_DIR)/src/charconv.cpp \
+        $(LIBCXX_DIR)/src/chrono.cpp \
         $(LIBCXX_DIR)/src/condition_variable.cpp \
         $(LIBCXX_DIR)/src/debug.cpp \
         $(LIBCXX_DIR)/src/exception.cpp \
@@ -52,7 +53,6 @@
         $(LIBCXX_DIR)/src/vector.cpp \
 
 
-# TODO add src/chrono.cpp when we have a gettime that uses timespecs.
 # TODO add src/random.cpp when there is support for getting entropy.