Make test-results upload URL configurable.

scripts/slave/recipe_modules/test_results/config.py

Index: scripts/slave/recipe_modules/test_results/config.py
diff --git a/scripts/slave/recipe_modules/test_results/config.py b/scripts/slave/recipe_modules/test_results/config.py
new file mode 100644
index 0000000000000000000000000000000000000000..202faa9ca2cb7a271df55616b1382533703a4830
--- /dev/null
+++ b/scripts/slave/recipe_modules/test_results/config.py
@@ -0,0 +1,19 @@
+
+from recipe_engine.config import config_item_context, ConfigGroup, Single
+
+def BaseConfig(**_kwargs):
+  return ConfigGroup(
+      test_results_server = Single(basestring))
+
+
+config_ctx = config_item_context(BaseConfig)
+
+
+@config_ctx(is_root=True)
+def BASE(c):
+  pass
+
+@config_ctx()
+def public_server(c):
+  c.test_results_server = 'test-results.appspot.com'
+