test.py: Use *.precompiled.js in csp mode for customHtml tests as well

tools/testing/dart/test_suite.dart

Index: tools/testing/dart/test_suite.dart
diff --git a/tools/testing/dart/test_suite.dart b/tools/testing/dart/test_suite.dart
index 85a93c964d8b5c8a6a0d0d523925e968ccdf3434..c0bf48f1a5711c18fb44f1e70da8546dbf7c37a7 100644
--- a/tools/testing/dart/test_suite.dart
+++ b/tools/testing/dart/test_suite.dart
@@ -1014,9 +1014,13 @@ class StandardTestSuite extends TestSuite {
               '<script type="text/javascript" '
                   'src="/packages/browser/dart.js"></script>');
           } else {
-            htmlContents = htmlContents.replaceAll('%TEST_SCRIPTS%',
-              '<script src="$nameNoExt.js"></script>');
             compiledDartWrapperFilename = '$tempDir/$nameNoExt.js';
+            var jsFile = '$nameNoExt.js';
+            if (configuration['csp']) {
+              jsFile = '$nameNoExt.precompiled.js';
+            }
+            htmlContents = htmlContents.replaceAll('%TEST_SCRIPTS%',
+              '<script src="$jsFile"></script>');
           }
           new File(htmlPath).writeAsStringSync(htmlContents);
         }