make it possible for VM to emit update monitors action

src/engine/runtime.js

@@ -233,6 +233,14 @@ class Runtime extends EventEmitter {
         return 'SPRITE_INFO_REPORT';
     }
 
+    /**
+     * Event name for monitors update.
+     * @const {string}
+     */
+    static get MONITORS_UPDATE () {
+        return 'MONITORS_UPDATE';
+    }
+
     /**
      * How rapidly we try to step threads by default, in ms.
      */
@@ -819,6 +827,14 @@ class Runtime extends EventEmitter {
         this.emit(Runtime.SPRITE_INFO_REPORT, target.toJSON());
     }
 
+    /**
+     * Emit a monitor update.
+     * @param {!Array} monitors Array of all monitors
+     */
+    monitorsUpdate (monitors) {
+        this.emit(Runtime.MONITORS_UPDATE, monitors);
+    }
+
     /**
      * Get a target by its id.
      * @param {string} targetId Id of target to find.

src/virtual-machine.js

@@ -55,6 +55,9 @@ class VirtualMachine extends EventEmitter {
         instance.runtime.on(Runtime.SPRITE_INFO_REPORT, spriteInfo => {
             instance.emit(Runtime.SPRITE_INFO_REPORT, spriteInfo);
         });
+        instance.runtime.on(Runtime.MONITORS_UPDATE, spriteInfo => {
+            instance.emit(Runtime.MONITORS_UPDATE, spriteInfo);
+        });
 
         this.blockListener = this.blockListener.bind(this);
         this.flyoutBlockListener = this.flyoutBlockListener.bind(this);