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We can't assume that all histograms are reset between test cases. We need to
remember start values for histograms before the test run, and subtract them from the
results.

memory_benchmark results before and after this CL are not comparable.

R=nduca
BUG=NONE
NOTRY=true


Review URL: https://chromiumcodereview.appspot.com/12221137

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@182467 0039d316-1c4b-4281-b951-d872f2087c98