Add optional mandatory policy setting for template generation

grit/format/policy_templates/writer_configuration.py

Index: grit/format/policy_templates/writer_configuration.py
diff --git a/grit/format/policy_templates/writer_configuration.py b/grit/format/policy_templates/writer_configuration.py
index 00da0ccb98ad9a34e50f6891348485f9a99d54db..88de6b5c3391cfc03c8b22dfc6ee4ad42d48a1d9 100644
--- a/grit/format/policy_templates/writer_configuration.py
+++ b/grit/format/policy_templates/writer_configuration.py
@@ -33,6 +33,7 @@ def GetConfigurationForBuild(defines):
       'win_recommended_category_path': ['chromium_recommended'],
       'admx_namespace': 'Chromium.Policies.Chromium',
       'admx_prefix': 'chromium',
+      'linux_policy_path': '/etc/chromium/policies/',
     }
   elif '_google_chrome' in defines:
     config = {
@@ -47,6 +48,7 @@ def GetConfigurationForBuild(defines):
       'win_recommended_category_path': ['google', 'googlechrome_recommended'],
       'admx_namespace': 'Google.Policies.Chrome',
       'admx_prefix': 'chrome',
+      'linux_policy_path': '/etc/opt/chrome/policies/',
     }
   else:
     raise Exception('Unknown build')