Fix equality/ordering of Sample
Fix equality/ordering of Sample

Only use sample_id within a process. Otherwise order by start_ns.

fuchsia-mirror/third_party-xi-editor,google/xi-editor,google/xi-editor,fuchsia-mirror/third_party-xi-editor,google/xi-editor,google/xi-editor,fuchsia-mirror/third_party-xi-editor,fuchsia-mirror/third_party-xi-editor