Java: add @bazel_tools//tools/java/runfiles

See https://github.com/bazelbuild/bazel/issues/5803

Change-Id: I49a2e744af667d34aedc3384629acd48641b0921

Closes #5804.

Change-Id: I75f85f02384fd1d9f6ebac5fff7c96c7278f7cdd
PiperOrigin-RevId: 208010815
diff --git a/tools/runfiles/BUILD.tools b/tools/runfiles/BUILD.tools
index d928523..6f107ea 100644
--- a/tools/runfiles/BUILD.tools
+++ b/tools/runfiles/BUILD.tools
@@ -1,6 +1,7 @@
 package(default_visibility = ["//visibility:public"])
 
-alias(
+java_library(
     name = "java-runfiles",
-    actual = "//src/tools/runfiles/java/com/google/devtools/build/runfiles",
+    exports = ["//src/tools/runfiles/java/com/google/devtools/build/runfiles"],
+    deprecation = "Depend on @bazel_tools//tools/java/runfiles instead. This target goes away in Bazel release 0.18.0",
 )