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generic_trace.py currently makes multiple calls to AddMeasurement()
with the same name if it encounters multiple trace items of the same
name. This is now broken, as patch [*] has forbidden that, and
requires caller to consolidate measurements of the same name into
a list.

This patch fixes generic_trace.py to follow the new requirements.

Change-Id: I44a0fbc1e4260bfbcbfc2558defd25a3f8cc3fb1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1899903
Commit-Queue: Xiaocheng Hu <xiaochengh@chromium.org>
Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
Reviewed-by: Ravi Mistry <rmistry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#713187}