Make document.activeElement work with OOPIF

content/renderer/render_frame_proxy.cc

Index: content/renderer/render_frame_proxy.cc
diff --git a/content/renderer/render_frame_proxy.cc b/content/renderer/render_frame_proxy.cc
index a339f12f264dd8661da8c75dd097f636954e9eba..aebeaa7756b88b85e15a7ee6cd288f7b336ceee7 100644
--- a/content/renderer/render_frame_proxy.cc
+++ b/content/renderer/render_frame_proxy.cc
@@ -221,6 +221,7 @@ bool RenderFrameProxy::OnMessageReceived(const IPC::Message& msg) {
     IPC_MESSAGE_HANDLER(FrameMsg_DidUpdateName, OnDidUpdateName)
     IPC_MESSAGE_HANDLER(FrameMsg_DidUpdateOrigin, OnDidUpdateOrigin)
     IPC_MESSAGE_HANDLER(InputMsg_SetFocus, OnSetPageFocus)
+    IPC_MESSAGE_HANDLER(FrameMsg_SetFocusedFrame, OnSetFocusedFrame)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
 
@@ -339,6 +340,12 @@ void RenderFrameProxy::OnSetPageFocus(bool is_focused) {
   render_view_->SetFocus(is_focused);
 }
 
+void RenderFrameProxy::OnSetFocusedFrame() {
+  // This uses focusDocumentView rather than setFocusedFrame so that blur
+  // events are properly dispatched on any currently focused elements.
+  render_view_->webview()->focusDocumentView(web_frame_);
+}
+
 void RenderFrameProxy::frameDetached(DetachType type) {
   if (type == DetachType::Remove && web_frame_->parent()) {
     web_frame_->parent()->removeChild(web_frame_);