Communicate ExtensionSettings policy to renderers

extensions/common/constants.cc

Index: extensions/common/constants.cc
diff --git a/extensions/common/constants.cc b/extensions/common/constants.cc
index ac685dd57e94a730e761ec6fd3107b9c097edfe6..967fb6d4bc45716160ba24eabfc34ff3f83f1dc2 100644
--- a/extensions/common/constants.cc
+++ b/extensions/common/constants.cc
@@ -113,4 +113,8 @@ const char* const kHangoutsExtensionIds[6] = {
     // Keep in sync with _api_features.json and _manifest_features.json.
 };
 
+// Error returned when scripting of a page is denied due to enterprise policy.
+const char kPolicyBlockedScripting[] =
+    "This page cannot be scripted due to an ExtensionsSettings policy.";
+
 }  // namespace extension_misc