Implement the close() API for Message ports

android_webview/java/src/org/chromium/android_webview/AwContents.java

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.android_webview;
 
 import android.annotation.SuppressLint;
 import android.app.Activity;
 import android.content.ComponentCallbacks2;
 import android.content.Context;
@@ skipping 1791 matching lines @@
         if (isDestroyed()) return;
         if (mPostMessageSender == null) {
             AwMessagePortService service = mBrowserContext.getMessagePortService();
             mPostMessageSender = new PostMessageSender(this, service);
             service.addObserver(mPostMessageSender);
         }
         mPostMessageSender.postMessage(frameName, message, targetOrigin,
                 sentPorts);
     }
 
-    /**
-     * Posts a message to the destination frame for real. The unique message port
-     * ids of any transferred port should be known at this time.
-     */
+    // Implements PostMessageSender.PostMessageSenderDelegate interface method.
+    @Override
+    public boolean isPostMessageSenderReady() {
+        return true;
+    }
+
+    // Implements PostMessageSender.PostMessageSenderDelegate interface method.
+    @Override
+    public void onPostMessageQueueEmpty() { }
+
+    // Implements PostMessageSender.PostMessageSenderDelegate interface method.
     @Override
     public void postMessageToWeb(String frameName, String message, String targetOrigin,
             int[] sentPortIds) {
         if (isDestroyed()) return;
         nativePostMessageToFrame(mNativeAwContents, frameName, message, targetOrigin,
                 sentPortIds);
     }
 
     /**
      * Creates a message channel and returns the ports for each end of the channel.
@@ skipping 938 matching lines @@
     private native void nativeCreatePdfExporter(long nativeAwContents, AwPdfExporter awPdfExporter);
 
     private native void nativePreauthorizePermission(long nativeAwContents, String origin,
             long resources);
 
     private native void nativePostMessageToFrame(long nativeAwContents, String frameId,
             String message, String targetOrigin, int[] msgPorts);
 
     private native void nativeCreateMessageChannel(long nativeAwContents, MessagePort[] ports);
 }