Configurable location for Crashpad storage

[tensh]

Is your feature request related to a problem? Please describe.
CEF currently doesn't allow you to run two instances of the same application without these (partially) sharing Crashpad storage location. Crash dump storage location is currently configurable by having the process set the BREAKPAD_DUMP_LOCATION environment variable, but the crash metrics storage location is not.

Describe the solution you'd like
We'd like the BREAKPAD_DUMP_LOCATION solution extended to also cover crash metrics storage, either by using a shared base path variable or multiple variables. If there are other features unrelated to Crashpad that doesn't allow you to configure custom base paths for storage it'd be great to have a way of configuring these too.

Describe alternatives you've considered
We can't think of an alternative method to achieve the same result that doesn't require changing CEF.