tracing: Minor compatibility changes to legacy trace macros
tracing: Minor compatibility changes to legacy trace macros

This patch applies some compatibility fixes to the legacy trace macro
interface to make it more compatible with Chrome:

1. Add some missing overloads for nestable async events.

2. Remove strongly typed trace point macros. These will be implemented
   in Chrome instead.

3. Add placeholders for binary-efficient trace points. For now, these
   map to regular trace points.

Bug: 1006541
Change-Id: I12d4215201fb746c487e52676e3cf76d2c6ae444
google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto