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Implement initializer list support for creating arrays and dictionaries
in TracedValue::Build. Thus speed up adding debugging tracing of
multiple parameters, including container types.

Reland with fix the problem of: crrev.com/c/2346286 by keeping a copy of
a std::string instead of just keeping a reference to it.

Bug: 1043616
Change-Id: I731347c24eff278f6e0c47887267de4d280b654a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2362657Reviewed-by: Eric Seckler <eseckler@chromium.org>
Reviewed-by: Alexander Timin <altimin@chromium.org>
Commit-Queue: Karel Král <karelkral@google.com>
Cr-Commit-Position: refs/heads/master@{#800170}