* Electron version: 1.6.10
* Operating system: macOS Sierra 10.12.4 (16E195)

# Improve Handoff API support

Hi!

Today the API of Handoff provides the methods: `setUserActivity`, `getCurrentActivityType` and dispatch the event `continue-activity`

I'm using Handoff and noticed that in some circumstances the broadcast takes a long time to update its userInfo which does not happen on the native iOS client

1. To invalidate or resign the current activity we currently need to create a non-existing activity type and set it as the current activity. There's no way to handle the activity life cycle through electron.
2. When we need to update a given user activity userInfo frequently (i.e in response to a search bar's text changes), we have no efficient way. Setting a new userActivity with the updated information takes several seconds to bridge, whereas doing this on iOS native app is instantaneous.

I believe that exposing a bit more of the NSUserActivity API to Electron would help, namely `becomeCurrent`, `resignCurrent` and `invalidate` which would address point 1, and `needsSave` and a new event to allow updating an activity when needed to address point 2.
These are described in more detail in https://developer.apple.com/reference/foundation/nsuseractivity.

I'm are open to help in any way i can such as explaining how the native API work, providing sample code or testing possible implementations

Thank you!
atom/browser/api/atom_api_app.cc
Browser::Get()->DockSetMenu(menu->model());
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v8::Local<v8::Value> App::GetDockAPI(v8::Isolate* isolate) {
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    auto browser = base::Unretained(Browser::Get());
    mate::Dictionary dock_obj = mate::Dictionary::CreateEmpty(isolate);
    dock_obj.SetMethod("bounce", &DockBounce);
    dock_obj.SetMethod(
        "cancelBounce",
        base::BindRepeating(&Browser::DockCancelBounce, browser));
    dock_obj.SetMethod(
        "downloadFinished",
        base::BindRepeating(&Browser::DockDownloadFinished, browser));
    dock_obj.SetMethod(
        "setBadge", base::BindRepeating(&Browser::DockSetBadgeText, browser));
    dock_obj.SetMethod(
        "getBadge", base::BindRepeating(&Browser::DockGetBadgeText, browser));
    dock_obj.SetMethod("hide",
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    dock_obj.SetMethod("show",
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    dock_obj.SetMethod("isVisible",
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    dock_obj.SetMethod("setMenu", &DockSetMenu);
    dock_obj.SetMethod("setIcon",
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