registerGlobalComponentMount(componentId, parentId) {
    this._incrementComponentCount();

    return this.globalEventStrategy.registerComponentMount(componentId, parentId);
  }
Registers that a component has now mounted, and declares its parent GlobalHotKeys
component id so that actions may be properly resolved
@param {ComponentId} componentId - Id of the component that has mounted
@param {ComponentId} parentId - Id of the parent GlobalHotKeys component