Expose CZML helper functions.

#1080 accidentally removed some helper functions needed for custom CZML processing.  I expect these function to go away in the near future, but they are definitely needed for now in apps that use custom CZML.

CC @emackey

Source/DynamicScene/CzmlDataSource.js

@@ -1304,6 +1304,49 @@ define([
         });
     };
 
+    /**
+     * A helper function used by custom CZML updater functions
+     * which creates or updates a {@link Property} from a CZML packet.
+     * @function
+     *
+     * @param {Function} type The constructor function for the property being processed.
+     * @param {Object} object The object on which the property will be added or updated.
+     * @param {String} propertyName The name of the property on the object.
+     * @param {Object} packetData The CZML packet being processed.y
+     * @param {TimeInterval} [interval] A constraining interval for which the data is valid.
+     * @param {String} [sourceUri] The originating uri of the data being processed.
+     * @returns {Boolean} True if a new property was created, false otherwise.
+     */
+    CzmlDataSource.processPacketData = processPacketData;
+
+    /**
+     * A helper function used by custom CZML updater functions
+     * which creates or updates a {@link PositionProperty} from a CZML packet.
+     * @function
+     *
+     * @param {Object} object The object on which the property will be added or updated.
+     * @param {String} propertyName The name of the property on the object.
+     * @param {Object} packetData The CZML packet being processed.y
+     * @param {TimeInterval} [interval] A constraining interval for which the data is valid.
+     * @param {String} [sourceUri] The originating uri of the data being processed.
+     * @returns {Boolean} True if a new property was created, false otherwise.
+     */
+    CzmlDataSource.processPositionPacketData = processPositionPacketData;
+
+    /**
+     * A helper function used by custom CZML updater functions
+     * which creates or updates a {@link MaterialProperty} from a CZML packet.
+     * @function
+     *
+     * @param {Object} object The object on which the property will be added or updated.
+     * @param {String} propertyName The name of the property on the object.
+     * @param {Object} packetData The CZML packet being processed.y
+     * @param {TimeInterval} [interval] A constraining interval for which the data is valid.
+     * @param {String} [sourceUri] The originating uri of the data being processed.
+     * @returns {Boolean} True if a new property was created, false otherwise.
+     */
+    CzmlDataSource.processMaterialPacketData = processMaterialPacketData;
+
     CzmlDataSource._processCzml = function(czml, dynamicObjectCollection, sourceUri, updaterFunctions) {
         var updatedObjects = [];
         var updatedObjectsHash = {};