Down-integrate from google internal.
diff --git a/Makefile.am b/Makefile.am
index 82ce190..e4dce6e 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -505,6 +505,7 @@
python/google/protobuf/internal/factory_test1.proto \
python/google/protobuf/internal/factory_test2.proto \
python/google/protobuf/internal/generator_test.py \
+ python/google/protobuf/internal/json_format_test.py \
python/google/protobuf/internal/message_factory_test.py \
python/google/protobuf/internal/message_listener.py \
python/google/protobuf/internal/message_set_extensions.proto \
@@ -560,6 +561,7 @@
python/google/protobuf/descriptor.py \
python/google/protobuf/descriptor_database.py \
python/google/protobuf/descriptor_pool.py \
+ python/google/protobuf/json_format.py \
python/google/protobuf/message.py \
python/google/protobuf/message_factory.py \
python/google/protobuf/proto_builder.py \