Implement the close() API for Message ports

android_webview/renderer/aw_message_port_client.cc

Index: android_webview/renderer/aw_message_port_client.cc
diff --git a/android_webview/renderer/aw_message_port_client.cc b/android_webview/renderer/aw_message_port_client.cc
index 7a5f67e062f1c692698a94e3f15b0bb93fe14168..54edf28940d752b5ae8f6b0d2056b2c8ceb2d2cc 100644
--- a/android_webview/renderer/aw_message_port_client.cc
+++ b/android_webview/renderer/aw_message_port_client.cc
@@ -34,6 +34,7 @@ bool AwMessagePortClient::OnMessageReceived(
   IPC_BEGIN_MESSAGE_MAP(AwMessagePortClient, message)
     IPC_MESSAGE_HANDLER(AwMessagePortMsg_WebToAppMessage, OnWebToAppMessage)
     IPC_MESSAGE_HANDLER(AwMessagePortMsg_AppToWebMessage, OnAppToWebMessage)
+    IPC_MESSAGE_HANDLER(AwMessagePortMsg_ClosePort, OnClosePort)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
 
@@ -95,4 +96,9 @@ void AwMessagePortClient::OnAppToWebMessage(
       result, sent_message_port_ids));
 }
 
+void AwMessagePortClient::OnClosePort(int message_port_id) {
+  Send(new AwMessagePortHostMsg_ClosePortAck(render_frame()->GetRoutingID(),
+                                             message_port_id));
+}
+
 }