We have several layers of no-trivial logic in the emulation pipeline, need to bring some sense into it.

Some anecdotal findings: emulation_params_.view_size == params.view_size check in DevToolsEmulator exists by accident, just because we pass 0 there. Not that it is important, but definitely misleading.

We also store old values in all 3 layers and also modify those values from layer to layer (dsf is always from host on the renderer side).

We need a model where setDeviceMetricsOverride is playing nicely with the setVisibleSize, etc.

This can wait :)