Expose whether a frame is focused to the browser process

content/browser/frame_host/render_frame_host_impl.cc

Index: content/browser/frame_host/render_frame_host_impl.cc
diff --git a/content/browser/frame_host/render_frame_host_impl.cc b/content/browser/frame_host/render_frame_host_impl.cc
index f284e5765ae46ad8fe3d6ec78e6a8c38ec56c3af..edd830a3c060b0c40056cecc967e052a566c5f55 100644
--- a/content/browser/frame_host/render_frame_host_impl.cc
+++ b/content/browser/frame_host/render_frame_host_impl.cc
@@ -258,6 +258,12 @@ ServiceRegistry* RenderFrameHostImpl::GetServiceRegistry() {
   return service_registry_.get();
 }
 
+bool RenderFrameHostImpl::IsFocused() const {
+  return GetRenderWidgetHost()->is_focused() &&
+         frame_tree_->GetFocusedFrame() &&
+         frame_tree_->GetFocusedFrame()->current_frame_host() == this;
+}
+
 bool RenderFrameHostImpl::Send(IPC::Message* message) {
   if (IPC_MESSAGE_ID_CLASS(message->type()) == InputMsgStart) {
     return render_view_host_->input_router()->SendInput(
@@ -731,7 +737,7 @@ void RenderFrameHostImpl::OnDidDropNavigation() {
   delegate_->DidStopLoading(this);
 }
 
-RenderWidgetHostImpl* RenderFrameHostImpl::GetRenderWidgetHost() {
+RenderWidgetHostImpl* RenderFrameHostImpl::GetRenderWidgetHost() const {
   return static_cast<RenderWidgetHostImpl*>(render_view_host_);
 }