Use proto_lang_toolchain in java_lite_proto_library.

--
MOS_MIGRATED_REVID=138005602
diff --git a/tools/BUILD b/tools/BUILD
index c1a69c5..19d04c5 100644
--- a/tools/BUILD
+++ b/tools/BUILD
@@ -16,6 +16,7 @@
         "//tools/build_defs/pkg:srcs",
         "//tools/build_defs/repo:srcs",
         "//tools/build_rules:srcs",
+        "//tools/proto/toolchains:srcs",
         "//tools/jdk:srcs",
         "//tools/genrule:srcs",
         "//tools/cpp:srcs",
@@ -40,6 +41,7 @@
         "//tools/build_defs/repo:srcs",
         "//tools/build_rules:embedded_tools_srcs",
         "//tools/buildstamp:srcs",
+        "//tools/proto/toolchains:srcs",
         "//tools/cpp:srcs",
         "//tools/genrule:srcs",
         "//tools/j2objc:srcs",