[infra] Add .vpython spec to fix gsutil on the bots (#31065)

Change-Id: I931695878cdcd9f014b1b751bbe52cfc2d524bb8
Reviewed-on: https://dart-review.googlesource.com/c/79262
Reviewed-by: Martin Kustermann <kustermann@google.com>
Commit-Queue: Alexander Thomas <athom@google.com>

.vpython

@@ -0,0 +1,36 @@
+# This is a vpython "spec" file.
+#
+# It describes patterns for python wheel dependencies of the python scripts in
+# the chromium repo, particularly for dependencies that have compiled components
+# (since pure-python dependencies can be easily vendored into third_party).
+#
+# When vpython is invoked, it finds this file and builds a python VirtualEnv,
+# containing all of the dependencies described in this file, fetching them from
+# CIPD (the "Chrome Infrastructure Package Deployer" service). Unlike `pip`,
+# this never requires the end-user machine to have a working python extension
+# compilation environment. All of these packages are built using:
+#   https://chromium.googlesource.com/infra/infra/+/master/infra/tools/dockerbuild/
+#
+# All python scripts in the repo share this same spec, to avoid dependency
+# fragmentation.
+#
+# If you have depot_tools installed in your $PATH, you can invoke python scripts
+# in this repo by running them as you normally would run them, except
+# substituting `vpython` instead of `python` on the command line, e.g.:
+#   vpython path/to/script.py some --arguments
+#
+# Read more about `vpython` and how to modify this file here:
+#   https://chromium.googlesource.com/infra/infra/+/master/doc/users/vpython.md
+
+python_version: "2.7"
+
+# Used by:
+#   tools/third_party/gsutil
+wheel: <
+  name: "infra/python/wheels/google_compute_engine-py2_py3"
+  version: "version:2.6.2"
+>
+wheel: <
+  name: "infra/python/wheels/boto-py2_py3"
+  version: "version:2.48.0"
+>

tools/bots/test_matrix.json

@@ -145,7 +145,8 @@
       "pkg/vm/",
       "runtime/",
       "sdk/",
-      ".packages"
+      ".packages",
+      ".vpython"
     ]
   },
   "configurations": {