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The heap dump v2 format requires that multiple heap dumps in the same trace
share IDs for nodes and strings. Since the JSON exporter is stateless, and isn't
aware of whether the dump will be part of a given trace, just give all nodes
and strings a unique ID.

Bug: 758739
Change-Id: I87002ce9a84c60ee7a41ac38d3702248a4aa6ae4
Reviewed-on: https://chromium-review.googlesource.com/895666Reviewed-by: Dmitry Skiba <dskiba@chromium.org>
Commit-Queue: Erik Chen <erikchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#533731}