tree 819e65fcbf5903e1f19cf15ec6f90ed2755346ed
parent 27e0b30d80dd0cde04285ba00f2af1647dca79ce
author Sami Kyostila <skyostil@google.com> 1582035098 +0000
committer Sami Kyostila <skyostil@google.com> 1582035098 +0000

TrackEvent: Add category tags and groups

This patch makes it possible to classify a single trace point to
multiple categories:

  TRACE_EVENT("benchmark,input", "Name);

Each category group must be registered at build time:

  PERFETTO_DEFINE_CATEGORIES(
    perfetto::Category::Group("benchmark,input")
  );

Additionally, we introduce a builder pattern for adding properties
such as tags and descriptions to categories:

  PERFETTO_DEFINE_CATEGORIES(
    perfetto::Category("moon_lander")
        .SetDescription("Events from the moon lander module"),
    perfetto::Category("moon_lander.verbose")
        .SetDescription("Verbose events from the moon lander module")
        .SetTags("slow")
  );

Design doc: https://docs.google.com/document/d/1YSmRh1g8QuyxHQxN26m_uUNN-F-RzwHidARbWvPeApY/

Bug: 148779455
Change-Id: I453a7b1539894361d4a72200154cc8bf8f43823a