[Android] Refactor bb_host_steps to prepare for downstream usage.

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
index 3f70caaac52634bf893f52d422f13b191f2ec26a..efab63ecd47c7977482f37483e0059be65035027 100644
--- a/build/android/buildbot/bb_utils.py
+++ b/build/android/buildbot/bb_utils.py
@@ -76,3 +76,16 @@ def GetParser():
 def EncodeProperties(options):
   return ['--factory-properties=%s' % json.dumps(options.factory_properties),
           '--build-properties=%s' % json.dumps(options.build_properties)]
+
+
+def RunSteps(all_steps, options):
+  steps = []
+  if options.steps:

[Isaac (away), 2013/06/12 21:37:35]

maybe change to

if not options.steps:
  return

and remove line 82

[Siva Chandra, 2013/06/13 00:09:56]

Done.

+    steps = options.steps.split(',')
+    unknown_steps = set(steps) - set(step for step, _ in all_steps)
+    if unknown_steps:
+      return sys.exit('Unknown steps %s' % list(unknown_steps))

[Isaac (away), 2013/06/12 21:37:35]

sys.exit does not return

[Siva Chandra, 2013/06/13 00:09:56]

Done.

+
+  for step, cmd in all_steps:
+    if step in steps:
+      cmd(options)