Make distcheck aware of test proto files.

src/Makefile.am

@@ -561,8 +561,8 @@ protoc_inputs =                                                   \
   google/protobuf/unittest_preserve_unknown_enum.proto            \
   google/protobuf/unittest.proto                                  \
   google/protobuf/unittest_proto3_arena.proto                     \
-  google/protobuf/unittest_proto3_arena_lite.proto                     \
-  google/protobuf/unittest_proto3_lite.proto                     \
+  google/protobuf/unittest_proto3_arena_lite.proto                \
+  google/protobuf/unittest_proto3_lite.proto                      \
   google/protobuf/unittest_well_known_types.proto                 \
   google/protobuf/util/internal/testdata/anys.proto               \
   google/protobuf/util/internal/testdata/books.proto              \
@@ -583,6 +583,12 @@ EXTRA_DIST =                                                   \
   $(protoc_inputs)                                             \
   $(js_well_known_types_sources)                               \
   solaris/libstdc++.la                                         \
+  google/protobuf/unittest_proto3.proto                        \
+  google/protobuf/unittest_import_public_proto3.proto          \
+  google/protobuf/unittest_import_proto3.proto                 \
+  google/protobuf/test_messages_proto3.proto                   \
+  google/protobuf/test_messages_proto2.proto                   \
+  google/protobuf/map_unittest_proto3.proto                    \
   google/protobuf/io/gzip_stream.h                             \
   google/protobuf/io/gzip_stream_unittest.sh                   \
   google/protobuf/testdata/golden_message                      \

tests.sh

@@ -61,7 +61,7 @@ build_cpp_distcheck() {
   make dist
 
   # List all files that should be included in the distribution package.
-  git ls-files | grep "^\(java\|python\|objectivec\|csharp\|js\|ruby\|php\|cmake\|examples\)" |\
+  git ls-files | grep "^\(java\|python\|objectivec\|csharp\|js\|ruby\|php\|cmake\|examples\|src/google/protobuf/.*\.proto\)" |\
     grep -v ".gitignore" | grep -v "java/compatibility_tests" |\
     grep -v "cmake/protobuf.*\.pc\.cmake" |\
     grep -v "python/compatibility_tests" | grep -v "csharp/compatibility_tests" > dist.lst