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We are trying to deprecate the page_cycler.indexeddb performance test.
One of the things done by that test and not indexeddb_perf is the
measurement of V8 memory statistics. This change brings V8 stats
into indexeddb_perf - but only a subset of the full measurements.
Opted for a smaller subset as the full set has too much unrelated
stuff, and we really want to catch things like unreleased objects,
etc.

Review URL: https://codereview.chromium.org/123553003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244054 0039d316-1c4b-4281-b951-d872f2087c98