[tools] Add streaming test runner

This adds a simple test runner that prints a line for every test with
the appropriate status prefix: PASS, FAIL, CRASH or TIMEOUT

Change-Id: Ic1ba78667c38cd4392af027bb6cb671b274680b7
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2264098
Reviewed-by: Liviu Rau <liviurau@chromium.org>
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68570}

tools/testrunner/base_runner.py

@@ -168,6 +168,7 @@ PROGRESS_INDICATORS = {
   'dots': progress.DotsProgressIndicator,
   'color': progress.ColorProgressIndicator,
   'mono': progress.MonochromeProgressIndicator,
+  'stream': progress.StreamProgressIndicator,
 }
 
 class TestRunnerError(Exception):

tools/testrunner/testproc/progress.py

@@ -113,6 +113,28 @@ class SimpleProgressIndicator(ProgressIndicator):
       print("===")
 
 
+class StreamProgressIndicator(ProgressIndicator):
+  def __init__(self):
+    super(StreamProgressIndicator, self).__init__()
+    self._requirement = base.DROP_PASS_OUTPUT
+
+  def _on_result_for(self, test, result):
+      if not result.has_unexpected_output:
+        self.print('PASS', test)
+      elif result.output.HasCrashed():
+        self.print("CRASH", test)
+      elif result.output.HasTimedOut():
+        self.print("TIMEOUT", test)
+      else:
+        if test.is_fail:
+          self.print("UNEXPECTED PASS", test)
+        else:
+          self.print("FAIL", test)
+
+  def print(self, prefix, test):
+    print('%s: %ss' % (prefix, test))
+    sys.stdout.flush()
+
 class VerboseProgressIndicator(SimpleProgressIndicator):
   def __init__(self):
     super(VerboseProgressIndicator, self).__init__()