1362126 - Remove "meta" property from subprocess profiles

Status: NEW

(Core :: Gecko Profiler, enhancement, P3)

Description

[Markus Stange [:mstange]]

Only the "root profile", i.e. the profile from the parent process, really needs this information. The meta objects in subprocess profiles are mostly duplicated data. The only non-duplicated piece of data in the meta object is the "processType" field, but that field is duplicated in each thread object on the subprocess profile, so we can drop it as well. If we want to store process-specific information in the profile in a per-process place (and not per-thread), then we can still add a processInfo field instead of using the meta field.