Add typedefs for heap profile API callbacks.
Add typedefs for heap profile API callbacks.

Bug: 185256136
Change-Id: If1b9f1eba58a837dbf14df6dd5c0706ffa8c4671
google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto