[Android] Add sharding for AMP instrumentation tests.

build/android/devil/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 164 matching lines @@
     r = type(self)(self._orig_objs)
     r._objs = reraiser_thread.ReraiserThreadGroup(
         [reraiser_thread.ReraiserThread(
             f, args=tuple([o] + list(args)), kwargs=kwargs,
             name='%s(%s)' % (f.__name__, d))
          for d, o in zip(self._orig_objs, self._objs)])
     r._objs.StartAll() # pylint: disable=W0212
     return r
 
   def _assertNoShadow(self, attr_name):
-    """Ensures that |attr_name| isn't shadowing part of the wrapped obejcts.
+    """Ensures that |attr_name| isn't shadowing part of the wrapped objects.
 
     If the wrapped objects _do_ have an |attr_name| attribute, it will be
     inaccessible to clients.
 
     Args:
       attr_name: The attribute to check.
     Raises:
       AssertionError if the wrapped objects have an attribute named 'attr_name'
       or '_assertNoShadow'.
     """
@@ skipping 36 matching lines @@
       f: The function to call.
       args: The positional args to pass to f.
       kwargs: The keyword args to pass to f.
     Returns:
       A Parallelizer wrapping the ReraiserThreadGroup running the map in
       parallel.
     """
     r = super(SyncParallelizer, self).pMap(f, *args, **kwargs)
     r.pFinish(None)
     return r
-