Trust me, I am skeptical of their efforts to promote "bipartisan" legislation. ESPECIALLY after the past eight years with President Obama.
With that said, there are ways where a bipartisan infrastructure bill (for example) could benefit Democrats just as much as it would Donald Trump. Spending money on bridges, roads, and airports benefits everyone. I know there is a lot of talk about impeachment, and depending on where the Flynn thing goes you never know what will happen, BUT we are only in the first three months of the Administration. A lot can happen in 4 years, including a more moderate Donald Trump working with Dems to get some (not all) things done.
Democrats would love the opportunity to spend 1T on infrastructure, and I think they'd vote for it as long as it wasnt attached to tax reform, health care, etc.