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This CL is adding the code to dump memory usage for inner-structures
used by URLIndexPrivateData.

The purpose of this CL is to estimate the size/count of the pathological
cases and to see which inner strucutures required limits.

NOTE: This CL need to be reverted before the M88 branch point on Nov 12.

Bug: 1068883
Change-Id: I5c4709d7ce7b634aa2ccf5b40bc19d6bff2e77eb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2504278
Commit-Queue: Etienne Bergeron <etienneb@chromium.org>
Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Reviewed-by: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#822249}