Hold messages in message port service when a message port is

android_webview/java/src/org/chromium/android_webview/PostMessageSender.java

Index: android_webview/java/src/org/chromium/android_webview/PostMessageSender.java
diff --git a/android_webview/java/src/org/chromium/android_webview/PostMessageSender.java b/android_webview/java/src/org/chromium/android_webview/PostMessageSender.java
index 01d7caed64e6e1e7c606cb5bd121370f32cf9635..318eaba94b4d2c4f140aadf97885c211bd9d1b10 100644
--- a/android_webview/java/src/org/chromium/android_webview/PostMessageSender.java
+++ b/android_webview/java/src/org/chromium/android_webview/PostMessageSender.java
@@ -122,8 +122,14 @@ public class PostMessageSender implements AwMessagePortService.MessageChannelObs
         // Sanity check all the ports that are being transferred.
         if (sentPorts != null) {
             for (MessagePort p : sentPorts) {
-                if (p.isClosed() || p.isTransferred()) {
-                    throw new IllegalStateException("Port cannot be transferred");
+                if (p.isClosed()) {
+                    throw new IllegalStateException("Closed port cannot be transfered");
+                }
+                if (p.isTransferred()) {
+                    throw new IllegalStateException("Port cannot be re-transferred");
+                }
+                if (p.isStarted()) {
+                    throw new IllegalStateException("Started port cannot be transferred");
                 }
                 p.setTransferred();
             }