Reland "Add expectations.txt validation to presubmit"

This is a reland of commit cde5589953

Original change's description:
> Add expectations.txt validation to presubmit
>
> Change-Id: Ibabdfbdf44b027a6e6441e140f23b2c2488f32dc
> Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/112120
> Reviewed-by: Ben Clayton <bclayton@google.com>
> Commit-Queue: Austin Eng <enga@chromium.org>
> Kokoro: Kokoro <noreply+kokoro@google.com>

Change-Id: I013eeec03e27b3147023ea094f5bde011561edd1
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/113540
Reviewed-by: Ben Clayton <bclayton@google.com>
Commit-Queue: Austin Eng <enga@chromium.org>
Kokoro: Austin Eng <enga@chromium.org>

go_presubmit_support.py

@@ -12,14 +12,21 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-def RunGoTests(input_api, output_api):
+
-    results = []
+def go_path(input_api):
-    try:
     go = input_api.os_path.join(input_api.change.RepositoryRoot(), "tools",
                                 "golang", "bin", "go")
     if input_api.is_windows:
         go += '.exe'
-        input_api.subprocess.check_call_out([go, "test", "./..."],
+
+    return go
+
+
+def RunGoTests(input_api, output_api):
+    results = []
+    try:
+        input_api.subprocess.check_call_out(
+            [go_path(input_api), "test", "./..."],
             stdout=input_api.subprocess.PIPE,
             stderr=input_api.subprocess.PIPE,
             cwd=input_api.PresubmitLocalPath())

webgpu-cts/PRESUBMIT.py

@@ -0,0 +1,55 @@
+# Copyright 2022 The Dawn & Tint Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import sys
+
+USE_PYTHON3 = True
+
+
+def _DoCommonChecks(input_api, output_api):
+    sys.path += [input_api.change.RepositoryRoot()]
+
+    from go_presubmit_support import go_path
+
+    results = []
+    try:
+        tools_path = input_api.os_path.join(input_api.change.RepositoryRoot(),
+                                            'tools')
+        cts_bin = input_api.os_path.join(tools_path, 'bin', 'cts')
+        if input_api.is_windows:
+            cts_bin += '.exe'
+
+        cmd = [
+            go_path(input_api), 'build', '-o', cts_bin,
+            input_api.os_path.join('.', 'cmd', 'cts')
+        ]
+        input_api.subprocess.check_call_out(cmd,
+                                            stdout=input_api.subprocess.PIPE,
+                                            stderr=input_api.subprocess.PIPE,
+                                            cwd=input_api.os_path.join(
+                                                tools_path, 'src'))
+
+        cmd = [cts_bin, 'validate']
+        input_api.subprocess.check_call_out(
+            cmd,
+            stdout=input_api.subprocess.PIPE,
+            stderr=input_api.subprocess.PIPE,
+            cwd=input_api.change.RepositoryRoot())
+    except input_api.subprocess.CalledProcessError as e:
+        results.append(output_api.PresubmitError('%s' % (e, )))
+    return results
+
+
+CheckChangeOnUpload = _DoCommonChecks
+CheckChangeOnCommit = _DoCommonChecks