Revert "[build] Track glob dependencies via depfiles, instead of alwa…

…ys re-executing scripts at GN time."

This reverts commit 8d436a2.

Reason for revert: ninja is always dirty

Original change's description:
> [build] Track glob dependencies via depfiles, instead of always re-executing scripts at GN time.
>
> Bug: flutter/flutter#81074
> Change-Id: I3fba7743f89b970dfd8d4d47b21f7d51be7a9cdb
> Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/196981
> Commit-Queue: Ryan Macnak <rmacnak@google.com>
> Reviewed-by: Chinmay Garde <chinmaygarde@google.com>
> Reviewed-by: Ben Konyi <bkonyi@google.com>

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: flutter/flutter#81074
Change-Id: I74c9ce055ad49107ae0d21f2f3b9b74991fc81d1
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/198441
Reviewed-by: Ryan Macnak <rmacnak@google.com>
Commit-Queue: Ryan Macnak <rmacnak@google.com>

tools/create_timestamp_file.py

@@ -0,0 +1,19 @@
+#!/usr/bin/env python3
+# Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+# for details. All rights reserved. Use of this source code is governed by a
+# BSD-style license that can be found in the LICENSE file.
+
+import sys
+import os
+
+
+def main(args):
+    for file_name in args[1:]:
+        dir_name = os.path.dirname(file_name)
+        if not os.path.exists(dir_name):
+            os.mkdir(dir_name)
+        open(file_name, 'w').close()
+
+
+if __name__ == '__main__':
+    sys.exit(main(sys.argv))

utils/create_timestamp.gni

@@ -10,15 +10,16 @@ template("create_timestamp_file") {
   path = invoker.path
   output = invoker.output
   action(target_name) {
-    script = "$_dart_root/tools/list_dart_files_as_depfile.py"
-    args = [
-      rebase_path(output),
-      path,
-    ]
+    list_args = [ path ]
     if (defined(invoker.pattern)) {
-      args += [ invoker.pattern ]
+      list_args += [ invoker.pattern ]
     }
-    depfile = output
+    files = exec_script("$_dart_root/tools/list_dart_files.py",
+                        [ "absolute" ] + list_args,
+                        "list lines")
+    inputs = [ "$_dart_root/tools/list_dart_files.py" ] + files
     outputs = [ output ]
+    script = "$_dart_root/tools/create_timestamp_file.py"
+    args = [ rebase_path(output) ]
   }
 }