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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.

Follow-up of: crrev.com/c/2263160

Bug: 1043616
Change-Id: I2d3205d550e6ce6328ea253e6b94f9cc2cbe3098
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2346286Reviewed-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@{#797706}