Update bisect_lib with the changes committed in the infra/build repo.

experimental/bisect_lib/depot_map.py

+# Copyright 2015 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.
+
+"""This module contains a mapping of depot names to paths on gitiles.
+
+This is used to fetch information from gitiles for different
+repositories supported by auto-bisect.
+"""
+
+# For each entry in this map, the key is a "depot" name (a Chromium dependency
+# in the DEPS file) and the value is a path used for the repo on gitiles; each
+# repo can be found at https://chromium.googlesource.com/<PATH>.
+DEPOT_PATH_MAP = {
+    'chromium': 'chromium/src',
+    'angle': 'angle/angle',
+    'v8': 'v8/v8.git',
+    'skia': 'skia',
+}