Propagating theming information from host applications to host extensions

Mechanisms are described herein for propagating a theme definition from a host application to a host extension so that the host application and the host extension are visually consistent. A theme definition may be updated after a theme change event occurs as a result of a user interacting with the host application. The theme definition may then be utilized by the host extension to update one or more UI elements presented by the host extension to enable visual consistency. 本文描述了用于将主题定义从主机应用传播到主机扩展的机构，从而主机应用和主机扩展视觉上致。可以在主题改变事件发生之后，归因于用户与主机应用的交互而更新主题定义。然后可以通过主机扩展使用主题定义，以更新由主机扩展呈现的个或多个UI元素，以使得能够视觉致。