Add Observatory mojo_shell hearbeat test

mojo/tools/get_test_list.py

Index: mojo/tools/get_test_list.py
diff --git a/mojo/tools/get_test_list.py b/mojo/tools/get_test_list.py
index f1e6db3267a4bd1c22ba37b4f4cb42a92f327f28..353db82ee1370aee2eceb5662df39ed7d6156b18 100755
--- a/mojo/tools/get_test_list.py
+++ b/mojo/tools/get_test_list.py
@@ -151,6 +151,15 @@ def GetTestList(config, verbose_count=0):
                       config.values["test_results_server"]]
     AddXvfbEntry("Sky tests", sky_command)
 
+  # Observatory tests (Linux-only):
+  if target_os == Config.OS_LINUX:
+    AddEntry("Dart Observatory tests",
+             ["python",
+              os.path.join("mojo", "dart", "observatory_tester", "runner.py"),
+              "--build-dir=" + os.path.abspath(build_dir),
+              "--dart-exe=" +
+                    os.path.abspath("third_party/dart-sdk/dart-sdk/bin/dart")])
+
   # mojo tools unit tests:
   if ShouldRunTest(Config.TEST_TYPE_DEFAULT, Config.TEST_TYPE_UNIT, "tools"):
     AddEntry("Mojo tools unit tests",