RenderFrameMetadata encompasses information which the Renderer process needs to provide to the Browser process.

Currently the connection between these processes is via FrameSinkProvider::CreateForWidget.

In non-mash this is established during RenderThreadImpl::RequestNewLayerTreeFrameSink.

In mash this code is not used for establishing the FrameSinkProvider connection.

We will eventually need to find a path supported by mash to form this connection.

We will be porting over a series of tests to use RenderFrameMetadata to replace older test apis which do not work in Viz. I'll be disabling the impacted tests on Mash and linking to this issue.