Treat dictionary polies as strings when generating appconfig.xml

Bug: 1065906
Change-Id: Ia8fc6d9e5bd352c3616bb0a9a99c5835055b74e2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2144676Reviewed-by: Julian Pastarmov <pastarmovj@chromium.org>
Commit-Queue: Yann Dago <ydago@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758836}

components/policy/tools/template_writers/writers/ios_app_config_writer.py

@@ -54,7 +54,7 @@ class IOSAppConfigWriter(xml_formatted_writer.XMLFormattedWriter):
         'string-enum-list': 'stringArray',
         'main': 'boolean',
         'list': 'stringArray',
-        'dict': None,
+        'dict': 'string',
     }
 
   def GetTemplateText(self):

components/policy/tools/template_writers/writers/ios_app_config_writer_unittest.py

@@ -125,9 +125,10 @@ class IOSAppConfigWriterUnitTests(writer_unittest_common.WriterUnittestCommon):
 
   def testDictPolicy(self):
     policy_json = self._GetTestPolicyTemplate('DictPolicy', 'dict')
-    # Dict policies are not supported by the appconfig.xml format and should not
-    # be present in the output.
-    expected = self._GetExpectedOutput('83.0.4089.0', None)
+    # Dict policies are not supported by the appconfig.xml format, therefore
+    # they are treated as JSON strings.
+    expected = self._GetExpectedOutput('83.0.4089.0',
+                                       '<string keyName="DictPolicy"/>')
     output = self.GetOutput(policy_json, {
         '_google_chrome': '1',
         'version': '83.0.4089.0'