Implement sequential focus navigation for OOPIF.

content/browser/frame_host/render_frame_proxy_host.cc

Index: content/browser/frame_host/render_frame_proxy_host.cc
diff --git a/content/browser/frame_host/render_frame_proxy_host.cc b/content/browser/frame_host/render_frame_proxy_host.cc
index c921e04697adbfb4625e7d50bbb7538cdfc7b791..1df93b86b8082a410241833bad83b16c49858923 100644
--- a/content/browser/frame_host/render_frame_proxy_host.cc
+++ b/content/browser/frame_host/render_frame_proxy_host.cc
@@ -146,6 +146,7 @@ bool RenderFrameProxyHost::OnMessageReceived(const IPC::Message& msg) {
     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;
@@ -325,4 +326,25 @@ void RenderFrameProxyHost::OnDidChangeOpener(int32 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