Add mac-arm64 to chromium/src vpython validation.

Update pathos wheel version to one that exists for mac-arm64.

Bug: 1235841
Change-Id: I2b400014059d476370fa0bc0873a80035885e937
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3163748
Reviewed-by: Dirk Pranke <dpranke@google.com>
Reviewed-by: Brian Ryner <bryner@google.com>
Commit-Queue: Brian Ryner <bryner@google.com>
Cr-Commit-Position: refs/heads/main@{#922144}

.vpython

@@ -27,6 +27,21 @@
 
 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"}
+]
+
 # Used by:
 #   build/chromeos/test_runner.py
 wheel: <
@@ -394,7 +409,7 @@ wheel: <
 #   //content/test/gpu
 wheel: <
   name: "infra/python/wheels/pathos/${vpython_platform}"
-  version: "version:0.2.7.chromium.3"
+  version: "version:0.2.7.chromium.4"
   not_match_tag <
     abi: "cp27mu"
     platform: "manylinux1_i686"

.vpython3

@@ -23,6 +23,21 @@
 #   https://chromium.googlesource.com/infra/infra/+/main/doc/users/vpython.md
 
 python_version: "3.8"
+
+# 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: "cp38", abi: "cp38", platform: "manylinux1_x86_64"},
+    {python: "cp38", abi: "cp38", platform: "linux_arm64"},
+
+    {python: "cp38", abi: "cp38", platform: "macosx_10_10_intel"},
+    {python: "cp38", abi: "cp38", platform: "macosx_11_0_arm64"},
+
+    {python: "cp38", abi: "cp38", platform: "win32"},
+    {python: "cp38", abi: "cp38", platform: "win_amd64"}
+]
+
 # Used by:
 #   build/android/pylib/local/emulator/avd.py
 #   components/policy/test_support/policy_testserver.py