Add a mojo channel for frame messages.

content/browser/site_per_process_browsertest.cc

 // Copyright (c) 2012 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/browser/site_per_process_browsertest.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 7833 matching lines @@
   GURL main_url(embedded_test_server()->GetURL(
       "a.com", "/cross_site_iframe_factory.html?a(b)"));
   EXPECT_TRUE(NavigateToURL(shell(), main_url));
 
   FrameTreeNode* root = static_cast<WebContentsImpl*>(shell()->web_contents())
                             ->GetFrameTree()
                             ->root();
 
   // "Select all" in the subframe.  The bug only happens if there's a selection
   // change, which triggers the path through didChangeSelection.
-  root->child_at(0)->current_frame_host()->Send(new InputMsg_SelectAll(
-      root->child_at(0)->current_frame_host()->GetRoutingID()));
+  root->child_at(0)->current_frame_host()->GetFrameInputHandler()->SelectAll();
 
   // Prevent b.com process from terminating right away once the subframe
   // navigates away from b.com below.  This is necessary so that the renderer
   // process has time to process the closings of RenderWidget and RenderView,
   // which is where the original bug was triggered.  Incrementing worker
   // RefCount will cause RenderProcessHostImpl::Cleanup to forego process
   // termination.
   RenderProcessHost* subframe_process =
       root->child_at(0)->current_frame_host()->GetProcess();
   subframe_process->IncrementSharedWorkerRefCount();
@@ skipping 2280 matching lines @@
   // the body of the page.
   std::string body;
   EXPECT_TRUE(ExecuteScriptAndExtractString(root->child_at(0), R"(
     var body = document.getElementsByTagName('pre')[0].innerText;
     window.domAutomationController.send(body);)",
                                             &body));
   EXPECT_EQ("my_token=my_value\n", body);
 }
 
 }  // namespace content