Add callstack to tooltips on unwinding error (#3694)
Add callstack to tooltips on unwinding error (#3694)

We now expose the (potentially) broken callstack for unwinding
errors in the callstack view.

This change, also adds the callstack to the tooltip.

Test: Take a capture, however over a gray callstack.
Bug: http://b/232060791
google/orbit,google/orbit,google/orbit,google/orbit