[Do Not Submit] Rough draft enabling junit tests for android studio

build/config/android/internal_rules.gni

Index: build/config/android/internal_rules.gni
diff --git a/build/config/android/internal_rules.gni b/build/config/android/internal_rules.gni
index f656ea6854a3aea061b680c6bad559bc2ce49831..187eae7b42e8fe6bd30ae9d5a1e0a265c79d9148 100644
--- a/build/config/android/internal_rules.gni
+++ b/build/config/android/internal_rules.gni
@@ -371,6 +371,9 @@ template("write_build_config") {
       ]
       args += [ "--fail=$_msg" ]
     }
+    if (defined(invoker.not_chromium_code) && invoker.not_chromium_code) {
+      args += [ "--not-chromium-code" ]
+    }
   }
 }
 
@@ -2275,6 +2278,13 @@ if (enable_java_templates) {
         } else {
           type = "java_library"
         }
+        not_chromium_code = false
+
+        # If it's not chromium code then we don't support modifying it in
+        # android studio.
+        if (defined(invoker.chromium_code) && !invoker.chromium_code) {
+          not_chromium_code = true
+        }
         if (defined(invoker.deps)) {
           possible_config_deps = invoker.deps
         }