Revert "[Python3] Clean up python2 holdovers"

This reverts commit 70de8dd1.

Reason for revert:
https://ci.chromium.org/ui/p/v8/builders/ci/V8%20Arm%20-%20debug/23885/overview

Original change's description:
> [Python3] Clean up python2 holdovers
>
> Cq-Include-Trybots: luci.v8.try.triggered:v8_android_arm64_n5x_rel_ng_triggered
> Bug: v8:9871
> Change-Id: I889fad886339e754ffee4e11cc06bc594e30641d
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3913200
> Commit-Queue: Michael Achenbach <machenbach@chromium.org>
> Reviewed-by: Liviu Rau <liviurau@google.com>
> Cr-Commit-Position: refs/heads/main@{#83391}

Bug: v8:9871
Change-Id: I862f4d1c57b1a6286502b8c219da477b0373927f
Cq-Include-Trybots: luci.v8.try.triggered:v8_android_arm64_n5x_rel_ng_triggered
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3916007
Auto-Submit: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#83394}

.vpython

+# This is a vpython "spec" file.
+#
+# It describes patterns for python wheel dependencies of the python scripts in
+# the V8 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 $PATH, you can invoke python scripts
+# in this repo by running them as you normally would run them, except
+# substituting `vpython` instead of `python` on the command line, e.g.:
+#   vpython path/to/script.py some --arguments
+#
+# Read more about `vpython` and how to modify this file here:
+#   https://chromium.googlesource.com/infra/infra/+/master/doc/users/vpython.md
+
+python_version: "2.7"
+
+# The default set of platforms vpython checks does not yet include mac-arm64.
+# Setting `verify_pep425_tag` to the list of platforms we explicitly must support
+# allows us to ensure that vpython specs stay mac-arm64-friendly
+verify_pep425_tag: [
+    {python: "cp27", abi: "cp27mu", platform: "manylinux1_x86_64"},
+    {python: "cp27", abi: "cp27mu", platform: "linux_arm64"},
+    {python: "cp27", abi: "cp27mu", platform: "linux_armv6l"},
+
+    {python: "cp27", abi: "cp27m", platform: "macosx_10_10_intel"},
+    {python: "cp27", abi: "cp27m", platform: "macosx_11_0_arm64"},
+
+    {python: "cp27", abi: "cp27m", platform: "win32"},
+    {python: "cp27", abi: "cp27m", platform: "win_amd64"}
+]
+
+# Needed by third_party/catapult/devil/devil, which is imported by
+# build/android/test_runner.py when running performance tests.
+wheel: <
+  name: "infra/python/wheels/psutil/${vpython_platform}"
+  version: "version:5.2.2"
+>
+
+# Used by:
+#   build/toolchain/win
+wheel: <
+  name: "infra/python/wheels/pypiwin32/${vpython_platform}"
+  version: "version:219"
+  match_tag: <
+    platform: "win32"
+  >
+  match_tag: <
+    platform: "win_amd64"
+  >
+>
+
+# Used by:
+#   tools/unittests/run_perf_test.py
+wheel: <
+  name: "infra/python/wheels/coverage/${vpython_platform}"
+  version: "version:4.3.4"
+>
+wheel: <
+  name: "infra/python/wheels/six-py2_py3"
+  version: "version:1.10.0"
+>
+wheel: <
+  name: "infra/python/wheels/pbr-py2_py3"
+  version: "version:3.0.0"
+>
+wheel: <
+  name: "infra/python/wheels/funcsigs-py2_py3"
+  version: "version:1.0.2"
+>
+wheel: <
+  name: "infra/python/wheels/mock-py2_py3"
+  version: "version:2.0.0"
+>
+
+# Used by:
+#   tools/run_perf.py
+#   tools/unittests/run_perf_test.py
+wheel: <
+  name: "infra/python/wheels/numpy/${vpython_platform}"
+  version: "version:1.11.3"
+>

BUILD.gn

@@ -6258,7 +6258,7 @@ group("gn_all") {
 }
 
 group("v8_python_base") {
-  data = [ ".vpython3" ]
+  data = [ ".vpython" ]
 }
 
 group("v8_clusterfuzz") {

DEPS

@@ -575,6 +575,16 @@ hooks = [
     'action': ['python3', 'tools/clang/scripts/update.py',
                '--package=objdump'],
   },
+  # Download and initialize "vpython" VirtualEnv environment packages.
+  {
+    'name': 'vpython_common',
+    'pattern': '.',
+    'condition': 'checkout_android',
+    'action': [ 'vpython',
+                '-vpython-spec', '.vpython',
+                '-vpython-tool', 'install',
+    ],
+  },
   {
     'name': 'vpython3_common',
     'pattern': '.',

tools/callstats.py.vpython

+# This is a vpython "spec" file.
+#
+# It describes patterns for python wheel dependencies of the python scripts in
+# the callstats.py, 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 $PATH, you can invoke python scripts
+# in this repo by running them as you normally would run them, except
+# substituting `vpython` instead of `python` on the command line, e.g.:
+#   vpython path/to/script.py some --arguments
+#
+# Read more about `vpython` and how to modify this file here:
+#   https://chromium.googlesource.com/infra/infra/+/master/doc/users/vpython.md
+
+python_version: "2.7"
+
+wheel: <
+  name: "infra/python/wheels/numpy/${vpython_platform}"
+  version: "version:1.11.3"
+>
+
+wheel: <
+  name: "infra/python/wheels/scipy/${vpython_platform}"
+  version: "version:0.19.0"
+  match_tag: <
+    abi: "cp27mu"
+    platform: "manylinux1_i686"
+  >
+  match_tag: <
+    abi: "cp27mu"
+    platform: "manylinux1_x86_64"
+  >
+>