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This will be used in the builder to generate stats to track the progress
of modularization (which is done by running some scripts manually at
the moment.

Sample output:
{"class_edges": 51396, "class_nodes": 8368, "inbound_ChromeActivity": 196, "inbound_ChromeTabbedActivity": 24, "package_cycles_size_equals_2": 390, "package_cycles_size_up_to_4": 19949, "package_edges": 7932, "package_nodes": 744}

Bug: 1133838
Change-Id: Ia732386706740df290e58b0187c25589320217b7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2441323
Commit-Queue: Henrique Nakashima <hnakashima@chromium.org>
Reviewed-by: Mohamed Heikal <mheikal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812930}