Convert libart-gtest to Android.bp

Change-Id: Ibea17e3e002e6ad3f82158cd3c69d087fa9b15c9
diff --git a/runtime/Android.bp b/runtime/Android.bp
index eb7b0c8..e4d50ee 100644
--- a/runtime/Android.bp
+++ b/runtime/Android.bp
@@ -462,6 +462,15 @@
     ],
 }
 
+art_cc_library {
+    name: "libart-runtime-gtest",
+    defaults: ["libart-gtest-defaults"],
+    srcs: ["common_runtime_test.cc"],
+    shared_libs: [
+        "libartd",
+    ],
+}
+
 subdirs = [
     "openjdkjvm",
     "openjdkjvmti",