Reland of [Telemetry] Switch clients to new JavaScript API (batch 5)

telemetry/telemetry/util/js_template_unittest.py

Index: telemetry/telemetry/util/js_template_unittest.py
diff --git a/telemetry/telemetry/util/js_template_unittest.py b/telemetry/telemetry/util/js_template_unittest.py
index c3d698aef975bfcb585b513f3ce6a14e759be19c..b233a8ab1a256a818dbe465aaf5590398a7b0be1 100644
--- a/telemetry/telemetry/util/js_template_unittest.py
+++ b/telemetry/telemetry/util/js_template_unittest.py
@@ -29,6 +29,12 @@
             var_name='foo', x='bar', y=None),
         'var foo = "bar" + null;')
 
+  def testRenderWithArgumentExpansion(self):
+    self.assertEquals(
+        js_template.Render(
+            '{{ @f }}({{ *args }})', f='foo', args=(1, 'hi!', None)),
+        'foo(1, "hi!", null)')
+
   def testRenderRaisesWithUnknownIdentifier(self):
     with self.assertRaises(KeyError):
       js_template.Render('foo({{ some_name }})', another_name='bar')