[Android] Test runner for python unit tests.

build/android/buildbot/bb_device_steps.py

Index: build/android/buildbot/bb_device_steps.py
diff --git a/build/android/buildbot/bb_device_steps.py b/build/android/buildbot/bb_device_steps.py
index e95a5529f3aa2d0b7f5c72ee10851ec955d90139..59dd94ce9b92e93df950d3620811a7000d437f79 100755
--- a/build/android/buildbot/bb_device_steps.py
+++ b/build/android/buildbot/bb_device_steps.py
@@ -77,7 +77,7 @@ INSTRUMENTATION_TESTS = dict((suite.name, suite) for suite in [
 
 VALID_TESTS = set(['chromedriver', 'chrome_proxy', 'gpu', 'mojo', 'sync',
                    'telemetry_perf_unittests', 'ui', 'unit', 'webkit',
-                   'webkit_layout'])
+                   'webkit_layout', 'python_unittests'])
 
 RunCmd = bb_utils.RunCmd
 
@@ -534,12 +534,19 @@ def RunGPUTests(options):
           EscapeBuilderName(builder_name)])
 
 
+def RunPythonUnitTests(_options):
+  for suite in constants.PYTHON_UNIT_TEST_SUITES:
+    bb_annotations.PrintNamedStep(suite)
+    RunCmd(['build/android/test_runner.py', 'python', '-s', suite])
+
+
 def GetTestStepCmds():
   return [
       ('chromedriver', RunChromeDriverTests),
       ('chrome_proxy', RunChromeProxyTests),
       ('gpu', RunGPUTests),
       ('mojo', RunMojoTests),
+      ('python_unittests', RunPythonUnitTests),
       ('sync', RunChromeSyncShellTests),
       ('telemetry_perf_unittests', RunTelemetryPerfUnitTests),
       ('ui', RunInstrumentationTests),