[test] Verbose test runner output on windows.

tools/testrunner/local/execution.py

Index: tools/testrunner/local/execution.py
diff --git a/tools/testrunner/local/execution.py b/tools/testrunner/local/execution.py
index 35e0efe7cfed032be4601bae3f9efcdf2b5d8755..e13393bf1c7626f1d64a48ab627e1f8dec1679aa 100644
--- a/tools/testrunner/local/execution.py
+++ b/tools/testrunner/local/execution.py
@@ -28,6 +28,7 @@
 
 import os
 import shutil
+import sys
 import time
 
 from pool import Pool
@@ -150,6 +151,7 @@ class Runner(object):
     self.indicator.HasRun(test, has_unexpected_output or test.run > 1)
     if has_unexpected_output:
       # Rerun test failures after the indicator has processed the results.
+      self._VerbosePrint("Attempting to rerun test after failure.")
       self._MaybeRerun(pool, test)
     # Update the perf database if the test succeeded.
     return not has_unexpected_output
@@ -241,7 +243,9 @@ class Runner(object):
         if update_perf:
           self._RunPerfSafe(lambda: self.perfdata.UpdatePerfData(test))
     finally:
+      self._VerbosePrint("Closing process pool.")
       pool.terminate()
+      self._VerbosePrint("Closing database connection.")
       self._RunPerfSafe(lambda: self.perf_data_manager.close())
       if self.perf_failures:
         # Nuke perf data in case of failures. This might not work on windows as
@@ -254,6 +258,11 @@ class Runner(object):
     # Make sure that any allocations were printed in predictable mode.
     assert not self.context.predictable or self.printed_allocations
 
+  def _VerbosePrint(self, text):
+    if self.context.verbose:
+      print text
+      sys.stdout.flush()
+
   def GetCommand(self, test):
     d8testflag = []
     shell = test.suite.shell()