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The remote texture is processed asynchronously, but the WebGL rendering results are rendered synchronously with WebRender transaction by WebRender. Async remote texture support is enabled only when CanvasRenderThread is used. This is to simplify implementation. In async mode, remote texture of current RemoteTextureId might not be created yet when WebRenderImageHost::UseRemoteTexture() is called. In this case, RemoteTextureHostWrapper uses its own external image ID, otherwise the RemoteTextureHostWrapper uses compatible old remote texture for creating wr display list. RenderTextureHostWrapper calls RemoteTextureMap::GetExternalImageIdOfRemoteTextureSync() before is ussage. The GetExternalImageIdOfRemoteTextureSync() synchronously waits until remote texture becomes ready. The wait works since WebGL IPC handling is always done in CanvasRenderThread in async mode. PWebGLChild::SendGetFrontBuffer() triggers sync IPC. It is called to ensure the compatible remote texture in RemoteTextureMap during RemoteTextureMap::GetRemoteTextureForDisplayList() call. Differential Revision: https://phabricator.services.mozilla.com/D162971