Support robolectric_test

robolectric_test will compile a suite of tests that run in
robolectric.  For now it also generates a Run* rule, later
that will be removed in favor of atest.

Bug: 123248659
Test: m RunSettingsLibRoboTests
Change-Id: I12407d0b0d639e31c1969077ba787e8985e6a506
diff --git a/Android.bp b/Android.bp
index 1fdd44e..25e2796 100644
--- a/Android.bp
+++ b/Android.bp
@@ -276,6 +276,7 @@
         "java/plugin.go",
         "java/prebuilt_apis.go",
         "java/proto.go",
+        "java/robolectric.go",
         "java/sdk.go",
         "java/sdk_library.go",
         "java/support_libraries.go",