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Make generateTracingFilePath take a basename as a parameter, to allow
C++ to customise the file name while relying on Java to figure out the
correct directory.

If an empty string is passed, Java will generate an appropriate unique
name.

R=skyostil@chromium.org
BUG=1157954

Change-Id: Ie94448ef1db1f57d0f15deba5fa54753285ea429
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2588331
Commit-Queue: Alexander Timin <altimin@chromium.org>
Reviewed-by: Yaron Friedman <yfriedman@chromium.org>
Reviewed-by: Sami Kyöstilä <skyostil@chromium.org>
Cr-Commit-Position: refs/heads/master@{#839973}