[Android] Convert to DeviceUtils versions of WaitUntilFullyBooted and GetExternalStoragePath.

build/android/pylib/utils/parallelizer.py

 # Copyright 2014 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.
 
 """ Wrapper that allows method execution in parallel.
 
 This class wraps a list of objects of the same type, emulates their
 interface, and executes any functions called on the objects in parallel
 in ReraiserThreads.
 
@@ skipping 62 matching lines @@
   def __getattr__(self, name):
     """Emulate getting the |name| attribute of |self|.
 
     Args:
       name: The name of the attribute to retrieve.
     Returns:
       A Parallelizer emulating the |name| attribute of |self|.
     """
     self.pGet(None)
 
-    r = Parallelizer(self._orig_objs)
+    r = type(self)(self._orig_objs)
     r._objs = [getattr(o, name) for o in self._objs]
     return r
 
   def __getitem__(self, index):
     """Emulate getting the value of |self| at |index|.
 
     Returns:
       A Parallelizer emulating the value of |self| at |index|.
     """
     self.pGet(None)
 
-    r = Parallelizer(self._orig_objs)
+    r = type(self)(self._orig_objs)
     r._objs = [o[index] for o in self._objs]
     return r
 
   def __call__(self, *args, **kwargs):
     """Emulate calling |self| with |args| and |kwargs|.
 
     Note that this call is asynchronous. Call pFinish on the return value to
     block until the call finishes.
 
     Returns:
       A Parallelizer wrapping the ReraiserThreadGroup running the call in
       parallel.
     Raises:
       AttributeError if the wrapped objects aren't callable.
     """
     self.pGet(None)
 
     if not self._objs:
       raise AttributeError('Nothing to call.')
     for o in self._objs:
       if not callable(o):
         raise AttributeError("'%s' is not callable" % o.__name__)
 
-    r = Parallelizer(self._orig_objs)
+    r = type(self)(self._orig_objs)
     r._objs = reraiser_thread.ReraiserThreadGroup(
         [reraiser_thread.ReraiserThread(
             o, args=args, kwargs=kwargs,
             name='%s.%s' % (str(d), o.__name__))
          for d, o in zip(self._orig_objs, self._objs)])
     r._objs.StartAll() # pylint: disable=W0212
     return r
 
   def pFinish(self, timeout):
     """Finish any outstanding asynchronous operations.
@@ skipping 57 matching lines @@
     Returns:
       A Parallelizer emulating the value returned from calling |self| with
       |args| and |kwargs|.
     Raises:
       AttributeError if the wrapped objects aren't callable.
     """
     r = super(SyncParallelizer, self).__call__(*args, **kwargs)
     r.pFinish(None)
     return r