Move Mojo channel initialization closer to IPC::Channel setup

content/renderer/web_ui_setup_impl.cc

Index: content/renderer/web_ui_setup_impl.cc
diff --git a/content/renderer/web_ui_setup_impl.cc b/content/renderer/web_ui_setup_impl.cc
new file mode 100644
index 0000000000000000000000000000000000000000..e4c065f8a807f30243e506ac18b89508d793064b
--- /dev/null
+++ b/content/renderer/web_ui_setup_impl.cc
@@ -0,0 +1,41 @@
+// 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/renderer/web_ui_setup_impl.h"
+
+#include "content/public/renderer/render_view.h"
+#include "content/renderer/web_ui_mojo.h"
+
+namespace content {
+
+// static
+void WebUISetupImpl::Bind(mojo::ScopedMessagePipeHandle handle) {
+  // This instance will be destroyed when the pipe is closed. See OnError.
+  new WebUISetupImpl(handle.Pass());
+}
+
+WebUISetupImpl::WebUISetupImpl(mojo::ScopedMessagePipeHandle handle)
+    : client_(ScopedWebUISetupClientHandle::From(handle.Pass()), this) {
+}
+
+WebUISetupImpl::~WebUISetupImpl() {
+}
+
+void WebUISetupImpl::SetWebUIHandle(
+    int32 view_routing_id,
+    mojo::ScopedMessagePipeHandle web_ui_handle) {
+  RenderView* render_view = RenderView::FromRoutingID(view_routing_id);
+  if (!render_view)
+    return;
+  WebUIMojo* web_ui_mojo = WebUIMojo::Get(render_view);
+  if (!web_ui_mojo)
+    return;
+  web_ui_mojo->SetBrowserHandle(web_ui_handle.Pass());
+}
+
+void WebUISetupImpl::OnError() {
+  delete this;
+}
+
+}  // namespace content