Use venv pip to build shared wheels

BUG=None
TEST=Presubmit hooks

Change-Id: I8a55c067aa2b7eed899b13065b289be36d24224d
Reviewed-on: https://chromium-review.googlesource.com/663774
Commit-Ready: Allen Li <ayatane@chromium.org>
Tested-by: Allen Li <ayatane@chromium.org>
Reviewed-by: Prathmesh Prabhu <pprabhu@chromium.org>
diff --git a/README.md b/README.md
index 87f3428..4df2ddb 100644
--- a/README.md
+++ b/README.md
@@ -21,7 +21,7 @@
 
 To add packages to this repository, run:
 
-    $ pip wheel -w path/to/pip_packages -r path/to/requirements.txt
+    $ bin/python_venv -m pip wheel -w path/to/pip_packages -r path/to/requirements.txt
 
 Commit the changes and make a CL.
 
diff --git a/pip_packages/wheel-0.30.0-py2.py3-none-any.whl b/pip_packages/wheel-0.30.0-py2.py3-none-any.whl
new file mode 100644
index 0000000..b7fbaa4
--- /dev/null
+++ b/pip_packages/wheel-0.30.0-py2.py3-none-any.whl
Binary files differ
diff --git a/venv/requirements.txt b/venv/requirements.txt
index e680622..58dcdb8 100644
--- a/venv/requirements.txt
+++ b/venv/requirements.txt
@@ -1,4 +1,12 @@
+coverage==4.4.1
+funcsigs==1.0.2
 mock==2.0.0
+pbr==1.10.0
+pip==8.1.2
+py==1.4.34
 pytest==3.1.3
 pytest-cov==2.5.1
+setuptools==28.2.0
+six==1.10.0
 subprocess32==3.2.7
+wheel==0.30.0