Add a new script bb_host_steps.py which handles all host side steps.

build/android/buildbot/bb_utils.py

Index: build/android/buildbot/bb_utils.py
diff --git a/build/android/buildbot/bb_utils.py b/build/android/buildbot/bb_utils.py
new file mode 100644
index 0000000000000000000000000000000000000000..2af87f35894decef8a4a1258ee2b78f9ff556521
--- /dev/null
+++ b/build/android/buildbot/bb_utils.py
@@ -0,0 +1,61 @@
+# Copyright (c) 2013 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import json
+import os
+import pipes
+import subprocess
+import sys
+
+sys.path.append(os.path.join(os.path.dirname(__file__), '..'))
+from pylib import buildbot_report
+from pylib import constants
+
+
+TESTING = 'BUILDBOT_TESTING' in os.environ
+
+
+def SpawnCmd(command):
+  """Spawn a process without waiting for termination."""
+  print '>', ' '.join(map(pipes.quote, command))
+  sys.stdout.flush()
+  if TESTING:
+    class MockPopen(object):
+      @staticmethod
+      def wait():
+        return 0
+    return MockPopen()
+
+  return subprocess.Popen(command, cwd=constants.CHROME_DIR)
+
+
+def RunCmd(command, flunk_on_failure=True, halt_on_failure=False,
+           retcode_callback=None):
+  """Run a command relative to the chrome source root."""
+  code = SpawnCmd(command).wait()
+  print '<', ' '.join(map(pipes.quote, command))
+  if retcode_callback:
+    retcode_callback(code)
+    return code
+  if code != 0:
+    print 'ERROR: process exited with code %d' % code
+    if flunk_on_failure:
+      buildbot_report.PrintError()
+    else:
+      buildbot_report.PrintWarning()
+    # Allow steps to have both halting (i.e. 1) and non-halting exit codes.
+    if code != 0 and code != 88 and halt_on_failure:
+      raise OSError()
+  return code
+
+
+def OptParserError(parser, msg):
+  """We avoid parser.error because it calls sys.exit."""
+  parser.print_help()
+  print >> sys.stderr, '\nERROR:', msg
+  return 1
+
+
+def ConvertJson(option, _, value, parser):
+  setattr(parser.values, option.dest, json.loads(value))