Add an AOSP builder recipe.

scripts/slave/recipe_util.py

Index: scripts/slave/recipe_util.py
diff --git a/scripts/slave/recipe_util.py b/scripts/slave/recipe_util.py
index 02e934c2585d39bdaa68567828b22e5e62c9ba88..c69ba5c02b723206e5ef91eef0a4e109709f2375 100644
--- a/scripts/slave/recipe_util.py
+++ b/scripts/slave/recipe_util.py
@@ -64,9 +64,11 @@ functionality provided by annotated_run.
 """  # pylint: disable=W0105
 checkout_path = _path_method('checkout_path', '%(CheckoutRootPlaceholder)s')
 
+def path_exists(path):
+  return _os.path.exists(path)
 
 @_contextlib.contextmanager
-def mock_paths():
+def mock_paths(paths_to_mock=None):
   """Used by unittest/recipes_test.py to temporarily override the paths
   generated by the various path functions in this module.
 
@@ -79,6 +81,7 @@ def mock_paths():
   g = globals()
   tokens = {}
   path_funcs = {}
+  paths_to_mock = frozenset(paths_to_mock or [])
   try:
     for name in path_base_names:
       token_name = (name + '_root').upper()
@@ -92,6 +95,10 @@ def mock_paths():
       if path_func_name in g:
         path_funcs[path_func_name] = g[path_func_name]
         g[path_func_name] = _path_method(path_func_name, token_val)
+
+    path_funcs['path_exists'] = g['path_exists']
+    g['path_exists'] = lambda path: path in paths_to_mock
+
     yield
   finally:
     g.update(tokens)
@@ -378,10 +385,18 @@ class Steps(object):
       self.git('submodule', 'update', '--init', '--recursive', cwd=dir_path),
     ]
 
-  def gclient_checkout(self, common_repo_name, git_mode=False):
+  def gclient_checkout(self, common_repo_name_or_spec, git_mode=False,
+                       spec_name=None):
     """Returns a step generator function for gclient checkouts."""
-    spec = GCLIENT_COMMON_SPECS[common_repo_name](self)
+    if isinstance(common_repo_name_or_spec, basestring):
+      spec = GCLIENT_COMMON_SPECS[common_repo_name_or_spec](self)
+    else:
+      spec = common_repo_name_or_spec
     spec_string = ''
+    if not spec_name:
+      step_name = lambda n: 'gclient ' + n
+    else:
+      step_name = lambda n: '[spec: %s] gclient %s' % (spec_name, n)
     for key in spec:
       # We should be using json.dumps here, but gclient directly execs the dict
       # that it receives as the argument to --spec, so we have to have True,
@@ -390,8 +405,9 @@ class Steps(object):
     gclient = depot_tools_path('gclient') + ('.bat' if IsWindows() else '')
 
     if not git_mode:
-      clean_step = self.step('gclient clean', [gclient, 'revert', '--nohooks'])
-      sync_step = self.step('gclient sync', [gclient, 'sync', '--nohooks'])
+      clean_step = self.step(step_name('clean'),
+                             [gclient, 'revert', '--nohooks'])
+      sync_step = self.step(step_name('sync'), [gclient, 'sync', '--nohooks'])
     else:
       # clean() isn't used because the gclient sync flags passed in checkout()
       # do much the same thing, and they're more correct than doing a separate
@@ -407,12 +423,12 @@ class Steps(object):
       # git-based builds (e.g. maybe some combination of 'git reset/clean -fx'
       # and removing the 'out' directory).
       clean_step = None
-      sync_step = self.step('gclient sync', [
+      sync_step = self.step(step_name('sync'), [
         gclient, 'sync', '--verbose', '--with_branch_heads', '--nohooks',
                      '--reset', '--delete_unversioned_trees', '--force'])
     steps = [
       self.step(
-        'gclient setup',
+        step_name('setup'),
         [gclient, 'config', '--spec', spec_string],
         static_json_data={
           'CheckoutRoot': slave_build_path(spec['solutions'][0]['name']),