[test] Fix missing heartbeats in test runner.

tools/testrunner/local/progress.py

Index: tools/testrunner/local/progress.py
diff --git a/tools/testrunner/local/progress.py b/tools/testrunner/local/progress.py
index 19d39f7e6193e4a66857564200a1cb019c3f1d7b..a9519e926d7552418e56aeaf2a7fb764e86bdfbb 100644
--- a/tools/testrunner/local/progress.py
+++ b/tools/testrunner/local/progress.py
@@ -292,6 +292,8 @@ class JUnitTestProgressIndicator(ProgressIndicator):
         test.duration,
         fail_text)
 
+  def Heartbeat(self):
+    self.progress_indicator.Heartbeat()
 
 class JsonTestProgressIndicator(ProgressIndicator):
 
@@ -364,6 +366,9 @@ class JsonTestProgressIndicator(ProgressIndicator):
       "duration": test.duration,
     })
 
+  def Heartbeat(self):
+    self.progress_indicator.Heartbeat()
+
 
 PROGRESS_INDICATORS = {
   'verbose': VerboseProgressIndicator,