Implement sequential focus navigation for OOPIF.

content/browser/frame_host/render_frame_proxy_host.cc

 // 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/browser/frame_host/render_frame_proxy_host.h"
 
 #include "base/lazy_instance.h"
 #include "content/browser/bad_message.h"
 #include "content/browser/frame_host/cross_process_frame_connector.h"
 #include "content/browser/frame_host/frame_tree.h"
@@ skipping 128 matching lines @@
   if (cross_process_frame_connector_.get() &&
       cross_process_frame_connector_->OnMessageReceived(msg))
     return true;
 
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(RenderFrameProxyHost, msg)
     IPC_MESSAGE_HANDLER(FrameHostMsg_Detach, OnDetach)
     IPC_MESSAGE_HANDLER(FrameHostMsg_OpenURL, OnOpenURL)
     IPC_MESSAGE_HANDLER(FrameHostMsg_RouteMessageEvent, OnRouteMessageEvent)
     IPC_MESSAGE_HANDLER(FrameHostMsg_DidChangeOpener, OnDidChangeOpener)
+    IPC_MESSAGE_HANDLER(FrameHostMsg_AdvanceFocus, OnAdvanceFocus)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
 }
 
 bool RenderFrameProxyHost::InitRenderFrameProxy() {
   DCHECK(!render_frame_proxy_created_);
 
   // It is possible to reach this when the process is dead (in particular, when
   // creating proxies from CreateProxiesForChildFrame).  In that case, don't
@@ skipping 159 matching lines @@
     target_rfh->Send(
         new FrameMsg_PostMessageEvent(target_rfh->GetRoutingID(), new_params));
   }
 }
 
 void RenderFrameProxyHost::OnDidChangeOpener(int32 opener_routing_id) {
   frame_tree_node_->render_manager()->DidChangeOpener(opener_routing_id,
                                                       GetSiteInstance());
 }
 
+void RenderFrameProxyHost::OnAdvanceFocus(blink::WebFocusType type,
+                                          int32 source_routing_id) {

[dcheng, 2015/12/04 23:11:01]

Nit: int32_t

[alexmos, 2015/12/05 00:07:45]

Done.

+  RenderFrameHostImpl* target_rfh =
+      frame_tree_node_->render_manager()->current_frame_host();
+
+  RenderFrameHostImpl* source_rfh =

[Charlie Reis, 2015/12/04 21:44:50]

nit: Add comment:
Translate the source RenderFrameHost in this process to its equivalent
RenderFrameProxyHost in the target process.

(Maybe also mention why we need to include it, i.e., for continuing the
traversal after the target frame finishes.)

[alexmos, 2015/12/04 22:21:17]

Done.

+      RenderFrameHostImpl::FromID(GetProcess()->GetID(), source_routing_id);
+  int source_proxy_routing_id = MSG_ROUTING_NONE;
+  if (source_rfh) {
+    RenderFrameProxyHost* source_proxy =
+        source_rfh->frame_tree_node()
+            ->render_manager()
+            ->GetRenderFrameProxyHost(target_rfh->GetSiteInstance());
+    if (source_proxy)
+      source_proxy_routing_id = source_proxy->GetRoutingID();
+  }
+
+  target_rfh->Send(new FrameMsg_AdvanceFocus(target_rfh->GetRoutingID(), type,
+                                             source_proxy_routing_id));
+}
+
 }  // namespace content