FrameMojoShell provides services to mojo apps.

content/browser/frame_host/render_frame_host_impl.cc

 // Copyright 2013 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/frame_host/render_frame_host_impl.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/containers/hash_tables.h"
 #include "base/lazy_instance.h"
@@ skipping 1557 matching lines @@
 
 #if defined(ENABLE_WEBVR)
   const base::CommandLine& browser_command_line =
       *base::CommandLine::ForCurrentProcess();
 
   if (browser_command_line.HasSwitch(switches::kEnableWebVR)) {
     GetServiceRegistry()->AddService<VRService>(
         base::Bind(&VRDeviceManager::BindRequest));
   }
 #endif
-
-  GetContentClient()->browser()->OverrideRenderFrameMojoServices(

[Ken Rockot(use gerrit already), 2015/07/06 18:58:00]

So how does this get called now?

[xhwang, 2015/07/07 19:21:04]

This call is renamed to OverrideFrameMojoShellServices and is called in
FrameMojoShell now. In the future we may need OverrideRenderFrameMojoServices
again and we can add it back then.

-      GetServiceRegistry(), this);
 }
 
 void RenderFrameHostImpl::SetState(RenderFrameHostImplState rfh_state) {
   // Only main frames should be swapped out and retained inside a proxy host.
   if (rfh_state == STATE_SWAPPED_OUT)
     CHECK(!GetParent());
 
   // We update the number of RenderFrameHosts in a SiteInstance when the swapped
   // out status of a RenderFrameHost gets flipped to/from active.
   if (!IsRFHStateActive(rfh_state_) && IsRFHStateActive(rfh_state))
@@ skipping 507 matching lines @@
   // We may be returning to an existing NavigationEntry that had been granted
   // file access.  If this is a different process, we will need to grant the
   // access again.  The files listed in the page state are validated when they
   // are received from the renderer to prevent abuse.
   if (request_params.page_state.IsValid()) {
     render_view_host_->GrantFileAccessFromPageState(request_params.page_state);
   }
 }
 
 }  // namespace content