Add a content API to create a message channel.

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
new file mode 100644
index 0000000000000000000000000000000000000000..e705d062120fe14e35eb5978018e4a5e5385894b
--- /dev/null
+++ b/content/browser/message_port_provider.cc
@@ -0,0 +1,69 @@
+// Copyright 2014 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.
+
+#include "content/public/browser/message_port_provider.h"
+
+#include "base/basictypes.h"
+#include "content/browser/message_port_message_filter.h"
+#include "content/browser/message_port_service.h"
+#include "content/browser/renderer_host/render_process_host_impl.h"
+#include "content/common/view_messages.h"
+#include "content/public/browser/browser_thread.h"
+#include "content/public/browser/render_view_host.h"
+#include "content/public/browser/web_contents.h"

[jochen (gone - plz use gerrit), 2014/11/18 13:29:41]

files in content/ should use the _impl.h versions

[jochen (gone - plz use gerrit), 2014/11/18 13:29:41]

files in content/ should use the _impl.h versions

[sgurun-gerrit only, 2014/11/18 22:51:55]

Done.

[sgurun-gerrit only, 2014/11/18 22:51:55]

Done.

+
+using base::string16;

[jochen (gone - plz use gerrit), 2014/11/18 13:29:41]

please don't add using for base:: types

[sgurun-gerrit only, 2014/11/18 22:51:55]

Done.

+
+namespace content {
+
+void MessagePortProvider::PostMessageToFrame(WebContents* web_contents,
+                                             string16* source_origin,
+                                             string16* target_origin,
+                                             string16* data,
+                                             std::vector<int>* ports) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+
+  RenderViewHost* rvh = web_contents->GetRenderViewHost();
+  if (!rvh)
+    return;
+
+  ViewMsg_PostMessage_Params params;
+  params.is_data_raw_string = true;
+  params.data = *data;
+  params.source_routing_id = web_contents->GetRoutingID();
+  params.source_origin = *source_origin;
+  params.target_origin = *target_origin;
+
+  RenderProcessHostImpl* rph =
+      static_cast<RenderProcessHostImpl*>(
+          web_contents->GetRenderProcessHost());
+  MessagePortMessageFilter* mf = rph->message_port_message_filter();
+
+  if (!ports->empty()) {
+    params.message_port_ids = *ports;
+    mf->UpdateMessagePortsWithNewRoutes(params.message_port_ids,
+                                        &params.new_routing_ids);
+  }
+  rvh->Send(new ViewMsg_PostMessageEvent(
+                web_contents->GetRenderViewHost()->GetRoutingID(),
+                params));
+}
+
+void MessagePortProvider::CreateMessageChannel(WebContents* web_contents,
+    int* port1, int* port2) {

[jochen (gone - plz use gerrit), 2014/11/18 13:29:41]

is this clang-formated?

[sgurun-gerrit only, 2014/11/18 22:51:55]

Done.

+  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);
+}
+
+} // namespace content