tree ad805791cb492a644daf75ba46a89f2550118234
parent 26aa46c283e40199b6f847ecca088dcea7099ded
author Aaron Wood <aaronwood@google.com> 1683332885 -0700
committer GN LUCI <gn-scoped@luci-project-accounts.iam.gserviceaccount.com> 1684201776 +0000

[tracing] Refine tracing of file writing and template execution

This disambiguates the writing of generated files and ninja files from
other write_file() commands, adds tracing of template invocations while
exec'ing files, and adds tracing of metadata walks.

A "before" trace can be found here, for a very large build that heavily
uses templates:
https://ui.perfetto.dev/#!/?s=ff7918ffc237b25bfafa04e0188cdd732be49d788aa65beb072fc16446e33468

and the "after" trace is:
https://ui.perfetto.dev/#!/?s=adeb4aba68882f380e7f88b3a45f15528722343ee3932d8dfc82e4120856a8a9


Change-Id: Ie7a445ff334e28dca97dfcd00c6398149c5b6b8a
Reviewed-on: https://gn-review.googlesource.com/c/gn/+/15280
Reviewed-by: Takuto Ikuta <tikuta@google.com>
Commit-Queue: Aaron Wood <aaronwood@google.com>