Stack Chart has a different notion of categories than the Call Tree

[past]

The Stack Chart apparently needs to be taught about the new categories that were recently introduced in the Call Tree. The category for mach_msg_trap should be Idle, not Platform.

[julienw]

The "Category" displayed in the stack chart is actually the "implementation" (using the sidebar terminology) of the frame (eg: native / ion / etc), but using different words: "Platform" for "native", "JIT" for "ion", "JS Baseline" for "baseline" and "JS Interpeter" for "Interpreter"; which isn't even completely true as the "baseline" is already a JIT.
Also #764 is related here.

[gregtatum]

Yeah, this should be updated. I also think while we are at it, we should clarify our use of implementation. I filed #1276 to not muddy the discussion this issue.