R1:23d8f000f709

Select the domain (X-axis range) for charts before pulling data

Summary:
Depends on D20441. Ref T13279. Currently, we pull all the data, then decide what the X-axis should look like.

Since users will reasonably want to do stuff like "show me march-april 2018" in the future, we need to move toward flipping this around so that we can support cases where the domain is specified by the user.

For actual chart functions (like "constant(3)" or "cos(x)"), we must also know the domain before we pull data, since…