Enable posting a message from JS to Android webview.

content/browser/message_port_provider.cc

Index: content/browser/message_port_provider.cc
diff --git a/content/browser/message_port_provider.cc b/content/browser/message_port_provider.cc
index 12be06530fdaa872e592fe2b5e541241f2bc6cb8..7f0d8932f1e87ced26a695243201950cf1561520 100644
--- a/content/browser/message_port_provider.cc
+++ b/content/browser/message_port_provider.cc
@@ -12,9 +12,11 @@
 #include "content/browser/renderer_host/render_view_host_impl.h"
 #include "content/browser/web_contents/web_contents_impl.h"
 #include "content/common/view_messages.h"
+#include "content/public/browser/message_port_delegate.h"
 
 namespace content {
 
+// static
 void MessagePortProvider::PostMessageToFrame(

[mnaganov (inactive), 2015/01/07 11:43:54]

Why do we need to do this on IO thread? Can we prepare all the data, except the
new routing ids on UI thread?

[sgurun-gerrit only, 2015/01/10 02:36:29]

Done.

     WebContents* web_contents,
     const base::string16& source_origin,
@@ -48,23 +50,28 @@ void MessagePortProvider::PostMessageToFrame(
                 params));
 }
 
-void MessagePortProvider::CreateMessageChannel(WebContents* web_contents,
+// static
+void MessagePortProvider::CreateMessageChannel(MessagePortDelegate* delegate,
                                                int* port1,
                                                int* port2) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
-
   *port1 = 0;
   *port2 = 0;
-
-  RenderProcessHostImpl* rph =
-      static_cast<RenderProcessHostImpl*>(
-          web_contents->GetRenderProcessHost());
-  MessagePortMessageFilter* mf = rph->message_port_message_filter();
   MessagePortService* msp = MessagePortService::GetInstance();
-  msp->Create(mf->GetNextRoutingID(), mf, port1);
-  msp->Create(mf->GetNextRoutingID(), mf, port2);
+  msp->Create(MSG_ROUTING_NONE, delegate, port1);
+  msp->Create(MSG_ROUTING_NONE, delegate, port2);
+  // Update the routing number of the message ports to be equal to the message
+  // port numbers.
+  msp->UpdateMessagePort(*port1, delegate, *port1);
+  msp->UpdateMessagePort(*port2, delegate, *port2);
   msp->Entangle(*port1, *port2);
   msp->Entangle(*port2, *port1);
 }
 
+// static
+void MessagePortProvider::OnMessagePortDelegateClosing(
+    MessagePortDelegate* delegate) {
+  MessagePortService::GetInstance()->OnMessagePortDelegateClosing(delegate);
+}
+
 } // namespace content