We want to move to a world where viz::Displays are no longer tied to ui::Compositors. ui::Compositor is an unprivileged "client library". FrameGenerator is:

1. Responsible for submitting a top level CompositorFrame that embeds the window 
   manager/browser UI. This means ash or browser UI are just another peer client in the 
   compositing system.

2. FrameGenerator is responsible for display resolution changes.

3. FrameGenerator is responsible for high contrast mode.

4. FrameGenerator is responsible for hit test region visualizations.

5. FrameGenerator is responsible for software mirroring mode.

The implications to content is "PerCompositorData" goes away in GpuProcessTransportFactory and other ContextFactory implementations.

FrameGenerator gets a "RootCompositorFrameSinkImpl" on the viz service side. This corresponds to calling HostFrameSinkManager::CreateRootCompositorFrameSink.

The end state is all OutputSurface code lives only in components/viz/service/display_embedder.

This is really a large umbrella bug that captures all this work. This may turn into more
subbugs.
 

We want to move to a world where viz::Displays are no longer tied to ui::Compositors. ui::Compositor is an unprivileged "client library". FrameGenerator is responsible for:

1. Submitting a top level CompositorFrame that embeds the window 
   manager/browser UI. This means ash or browser UI are just another peer client in the 
   compositing system.

2. Display resolution changes.

3. High contrast mode.

4. Hit test region visualizations.

5. Software mirroring mode.

The implications to content is "PerCompositorData" goes away in GpuProcessTransportFactory and other ContextFactory implementations.

FrameGenerator gets a "RootCompositorFrameSinkImpl" on the viz service side. This corresponds to calling HostFrameSinkManager::CreateRootCompositorFrameSink.

The end state is all OutputSurface code lives only in components/viz/service/display_embedder.

This is really a large umbrella bug that captures all this work. This may turn into more
subbugs.