meson: Move all code generation scripts to utils/codegen/

We have multiple code generation scripts in utils/, mixed with other
miscellaneous utilities, as well as a larger code base based on mojom in
utils/ipc/. To make code sharing easier between the generator scripts,
without creating a mess in the utils/ directory, move all the code
generation code to utils/codegen/.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Daniel Scally <dan.scally@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>

utils/codegen/ipc/tools/README

@@ -0,0 +1,4 @@
+# SPDX-License-Identifier: CC0-1.0
+
+Files in this directory are imported from 9be4263648d7 of Chromium. Do not
+modify them manually.

utils/codegen/ipc/tools/diagnosis/crbug_1001171.py

@@ -0,0 +1,51 @@
+# Copyright 2019 The Chromium Authors
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""Helper context wrapper for diagnosing crbug.com/1001171.
+
+This module and all uses thereof can and should be removed once
+crbug.com/1001171 has been resolved.
+"""
+
+from __future__ import print_function
+
+import contextlib
+import os
+import sys
+
+
+@contextlib.contextmanager
+def DumpStateOnLookupError():
+  """Prints potentially useful state info in the event of a LookupError."""
+  try:
+    yield
+  except LookupError:
+    print('LookupError diagnosis for crbug.com/1001171:')
+    for path_index, path_entry in enumerate(sys.path):
+      desc = 'unknown'
+      if not os.path.exists(path_entry):
+        desc = 'missing'
+      elif os.path.islink(path_entry):
+        desc = 'link -> %s' % os.path.realpath(path_entry)
+      elif os.path.isfile(path_entry):
+        desc = 'file'
+      elif os.path.isdir(path_entry):
+        desc = 'dir'
+      print('  sys.path[%d]: %s (%s)' % (path_index, path_entry, desc))
+
+      real_path_entry = os.path.realpath(path_entry)
+      if (path_entry.endswith(os.path.join('lib', 'python2.7'))
+          and os.path.isdir(real_path_entry)):
+        encodings_dir = os.path.realpath(
+            os.path.join(real_path_entry, 'encodings'))
+        if os.path.exists(encodings_dir):
+          if os.path.isdir(encodings_dir):
+            print('    %s contents: %s' % (encodings_dir,
+                                           str(os.listdir(encodings_dir))))
+          else:
+            print('    %s exists but is not a directory' % encodings_dir)
+        else:
+          print('    %s missing' % encodings_dir)
+
+    raise