GitLab

We deliberately leave out the process phase metadata information in the
StackSample encoding in this CL. Implementing that metadata support will
need to be done differently to make it extensible to general metadata.
We will implement it using follow-up CLs.

The old CallStackProfileBuilder using the legacy Sample encoding is
renamed to LegacyCallStackProfileBuilder. Related files are renamed
accordingly too.

Note that the old CallStackProfileBuilder is still used in production.

Bug: 851163, 804942
Change-Id: I235bd8cc839de4e663f1d4bd49aa24485649692a
Reviewed-on: https://chromium-review.googlesource.com/1205896Reviewed-by: François Doray <fdoray@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Reviewed-by: Siddhartha S <ssid@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Alexei Filippov <alph@chromium.org>
Reviewed-by: Mike Wittman <wittman@chromium.org>
Commit-Queue: Xi Cheng <chengx@chromium.org>
Cr-Commit-Position: refs/heads/master@{#590465}