registerComponentMount(componentId, parentId) {
    this.componentTree.setParent(componentId, parentId);

    this.logger.verbose(
      this.logger.nonKeyEventPrefix(componentId),
      'Registered component mount:\n',
      `${printComponent(this.componentTree.get(componentId))}`
    );
  }
Registers that a component has now mounted, and declares its parent hot keys
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 hot keys component