Code review comment for lp:~raof/mir/1hz-rendering-always

> In that case, I think the policy interface wants to be something like...

One decision we need to make (we can change it later of course), is whether we want a policy object per bundle or a single central policy object. The advantage of the later is that it allows us to change the drop timeout centrally, which could be useful if we want to set an optimal frame rate depending on the monitors present and power mode. For example we may want to set the drop rate as high as possible (but still below the smallest vsync rate for our timeout logic to work) when the device is plugged in, but drop to a lower rate for power saving modes.