Implement sequential focus navigation for OOPIF.

content/renderer/render_frame_impl.cc

Index: content/renderer/render_frame_impl.cc
diff --git a/content/renderer/render_frame_impl.cc b/content/renderer/render_frame_impl.cc
index 0db8f24e912c0fabcddef7f30b37c8e696090b5a..9b304b6226d4f9d27315946f8adddc047ea2dad3 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -1242,6 +1242,7 @@ bool RenderFrameImpl::OnMessageReceived(const IPC::Message& msg) {
     IPC_MESSAGE_HANDLER(FrameMsg_DidUpdateSandboxFlags, OnDidUpdateSandboxFlags)
     IPC_MESSAGE_HANDLER(FrameMsg_SetFrameOwnerProperties,
                         OnSetFrameOwnerProperties)
+    IPC_MESSAGE_HANDLER(FrameMsg_AdvanceFocus, OnAdvanceFocus)
     IPC_MESSAGE_HANDLER(FrameMsg_SetTextTrackSettings,
                         OnTextTrackSettingsChanged)
     IPC_MESSAGE_HANDLER(FrameMsg_PostMessageEvent, OnPostMessageEvent)
@@ -1800,6 +1801,17 @@ void RenderFrameImpl::OnSetFrameOwnerProperties(
   frame_->setFrameOwnerProperties(frame_owner_properties);
 }
 
+void RenderFrameImpl::OnAdvanceFocus(blink::WebFocusType type,
+                                     int source_routing_id) {
+  RenderFrameProxy* source_frame =
+      RenderFrameProxy::FromRoutingID(source_routing_id);
+  if (!source_frame)
+    return;
+
+  render_view_->webview()->advanceFocusAcrossFrames(
+      type, source_frame->web_frame(), frame_);
+}
+
 void RenderFrameImpl::OnTextTrackSettingsChanged(
     const FrameMsg_TextTrackSettings_Params& params) {
   DCHECK(!frame_->parent());