pip_packages: add pip 8.1.2

BUG=chromium:645611
TEST=Virtualenv setup now works in chroot, if
--extra-search-dir=pip_pacakges is added to create_env.sh

Change-Id: I985008a621d3339a0b7a7368d92e514f70ec0f71
diff --git a/pip-8.1.2-py2.py3-none-any.whl b/pip-8.1.2-py2.py3-none-any.whl
new file mode 100644
index 0000000..cc49227
--- /dev/null
+++ b/pip-8.1.2-py2.py3-none-any.whl
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