Move the apptest runner and parts of mopy to the public SDK.

mojo/tools/mopy/file_hash.py

Index: mojo/tools/mopy/file_hash.py
diff --git a/mojo/tools/mopy/file_hash.py b/mojo/tools/mopy/file_hash.py
deleted file mode 100644
index abdd821c985b21be3a065741927ea77468cce105..0000000000000000000000000000000000000000
--- a/mojo/tools/mopy/file_hash.py
+++ /dev/null
@@ -1,26 +0,0 @@
-# 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.
-
-import logging
-
-# pylint: disable=E0611
-from hashlib import sha256
-
-from mopy.memoize import memoize
-
-_logging = logging.getLogger()
-
-@memoize
-def file_hash(filename):
-  """Returns a string representing the hash of the given file."""
-  _logging.debug("Hashing %s ...", filename)
-  with open(filename, mode='rb') as f:
-    m = sha256()
-    while True:
-      block = f.read(4096)
-      if not block:
-        break
-      m.update(block)
-  _logging.debug("  => %s", m.hexdigest())
-  return m.hexdigest()