arc: Add base tracing model.

This builds base tracing model with ability to query using output of
chrome://tracing.
Tool prototype is available here:
https://drive.google.com/open?id=14LkHgqJNsd19uAwIlgL5x7l0_c6vxG1B

TEST=In context of prototype tool
BUG=b:122555793

Change-Id: Ic67860af53c4652e6cb64e88a13f0b7539220efe
Reviewed-on: https://chromium-review.googlesource.com/c/1406025
Commit-Queue: Yury Khmel <khmel@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#622251}
9 files changed