Support "always allow" for runtime script execution

extensions/browser/extension_prefs.cc

Index: extensions/browser/extension_prefs.cc
diff --git a/extensions/browser/extension_prefs.cc b/extensions/browser/extension_prefs.cc
index 3e04d79de2df1916906599d736584ab4c2fabfdc..8423e9ed9d4fdc43ef128e66969ffb22cbbed49b 100644
--- a/extensions/browser/extension_prefs.cc
+++ b/extensions/browser/extension_prefs.cc
@@ -148,6 +148,7 @@ const char kPrefAPIs[] = "api";
 const char kPrefManifestPermissions[] = "manifest_permissions";
 const char kPrefExplicitHosts[] = "explicit_host";
 const char kPrefScriptableHosts[] = "scriptable_host";
+const char kPrefPersistedPermissions[] = "persisted_permissions";
 
 // The preference names for the old granted permissions scheme.
 const char kPrefOldGrantedFullAccess[] = "granted_permissions.full";
@@ -1131,6 +1132,42 @@ void ExtensionPrefs::SetActivePermissions(
       extension_id, kPrefActivePermissions, permissions);
 }
 
+bool ExtensionPrefs::GetPersistedPermissions(
+    const std::string& extension_id,
+    URLPatternSet* persisted_permissions) {
+  CHECK(Extension::IdIsValid(extension_id));
+  return ReadPrefAsURLPatternSet(extension_id,
+                                 kPrefPersistedPermissions,
+                                 persisted_permissions,
+                                 UserScript::ValidUserScriptSchemes());
+}
+
+void ExtensionPrefs::AddPersistedPermission(const Extension* extension,
+                                            const URLPattern* pattern) {
+  DictionaryPrefUpdate update(prefs_, "extensions.settings");
+  base::DictionaryValue* dict = update.Get();
+  base::DictionaryValue* prefer = NULL;
+  dict->GetDictionary(extension->id(), &prefer);
+
+  base::ListValue* pattern_list = NULL;
+
+  if (!prefer->GetList(kPrefPersistedPermissions, &pattern_list)) {
+    prefer->Set(kPrefPersistedPermissions, new base::ListValue());
+    prefer->GetList(kPrefPersistedPermissions, &pattern_list);
+  }
+
+  pattern_list->Append(new base::StringValue(pattern->GetAsString()));
+}
+
+void ExtensionPrefs::ClearPersistedPermissions(const Extension* extension) {
+  DictionaryPrefUpdate update(prefs_, "extensions.settings");
+  base::DictionaryValue* dict = update.Get();
+  base::DictionaryValue* prefer = NULL;
+  dict->GetDictionary(extension->id(), &prefer);
+
+  prefer->Set(kPrefPersistedPermissions, new base::ListValue());
+}
+
 void ExtensionPrefs::SetExtensionRunning(const std::string& extension_id,
     bool is_running) {
   base::Value* value = new base::FundamentalValue(is_running);