在与 Google VR Asynchronous Video Re-Projection (AVR) 一同运行时启用受保护的内存支持。
受保护的内存支持目前是一个全有或全无功能。启用此功能时，只有受 DRM 保护的内容可以使用 AVR 播放。清除内容将无法播放。
注意：仅在初始化 VR 之前设置的情况下生效。
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