converted Content object. Note that $result->getContentModel() must return
$toModel.
+'ContentSecurityPolicyDefaultSource': Modify the allowed CSP load sources. This affects all
+directives except for the script directive. If you want to add a script
+source, see ContentSecurityPolicyScriptSource hook.
+&$defaultSrc: Array of Content-Security-Policy allowed sources
+$policyConfig: Current configuration for the Content-Security-Policy header
+$mode: ContentSecurityPolicy::REPORT_ONLY_MODE or ContentSecurityPolicy::FULL_MODE
+ depending on type of header
+
+'ContentSecurityPolicyDirectives': Modify the content security policy directives.
+Use this only if ContentSecurityPolicyDefaultSource and
+ContentSecurityPolicyScriptSource do not meet your needs.
+&$directives: Array of CSP directives
+$policyConfig: Current configuration for the CSP header
+$mode: ContentSecurityPolicy::REPORT_ONLY_MODE or
+ ContentSecurityPolicy::FULL_MODE depending on type of header
+
+'ContentSecurityPolicyScriptSource': Modify the allowed CSP script sources.
+Note that you also have to use ContentSecurityPolicyDefaultSource if you
+want non-script sources to be loaded from
+whatever you add.
+&$scriptSrc: Array of CSP directives
+$policyConfig: Current configuration for the CSP header
+$mode: ContentSecurityPolicy::REPORT_ONLY_MODE or ContentSecurityPolicy::FULL_MODE
+ depending on type of header
+
'CustomEditor': When invoking the page editor
Return true to allow the normal editor to be used, or false if implementing
a custom editor, e.g. for a special namespace, etc.