Adds keyboard shortcuts for changing script policy

App/Browser View/BrowserViewController+Keyboard.swift

@@ -177,4 +177,40 @@ extension BrowserViewController: ShortcutResponder
             createNewTab(withURL: event.url)
         }
     }
+    
+    func raiseScriptPolicyRestriction(_ sender: Any?) {
+        guard let hostOrigin = currentTab.webView.url?.securityOrigin else { return }
+        let currentPolicy = policyManager.scriptPolicy(forOrigin: hostOrigin)
+        policyManager.setScriptPolicyType(currentPolicy.policyType--, forOrigin: hostOrigin)
+        didChangeScriptPolicy()
+    }
+    
+    func lowerScriptPolicyRestriction(_ sender: Any?) {
+        guard let hostOrigin = currentTab.webView.url?.securityOrigin else { return }
+        let currentPolicy = policyManager.scriptPolicy(forOrigin: hostOrigin)
+        policyManager.setScriptPolicyType(currentPolicy.policyType++, forOrigin: hostOrigin)
+        didChangeScriptPolicy()
+    }
+}
+
+extension ScriptPolicy.PolicyType {
+    static postfix func ++ (obj: ScriptPolicy.PolicyType) -> ScriptPolicy.PolicyType {
+        switch obj {
+        case .alpha:    .bravo
+        case .bravo:    .charlie
+        case .charlie:  .delta
+        case .delta:    .echo
+        default: obj
+        }
+    }
+    
+    static postfix func -- (obj: ScriptPolicy.PolicyType) -> ScriptPolicy.PolicyType {
+        switch obj {
+        case .bravo:    .alpha
+        case .charlie:  .bravo
+        case .delta:    .charlie
+        case .echo:     .delta
+        default: obj
+        }
+    }
 }