JS - Collect and execute actions at doc and pages level

* the goal is to execute actions like Open or OpenAction
 * can be tested with issue6106.pdf (auto-print)
 * once #12701 is merged, we can add page actions

src/scripting_api/common.js

@@ -0,0 +1,26 @@
+/* Copyright 2020 Mozilla Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+function createActionsMap(actions) {
+  const actionsMap = new Map();
+  if (actions) {
+    for (const [eventType, actionsForEvent] of Object.entries(actions)) {
+      actionsMap.set(eventType, actionsForEvent);
+    }
+  }
+  return actionsMap;
+}
+
+export { createActionsMap };