Create memory histograms that also depend on the memory-model experiment
Create memory histograms that also depend on the memory-model experiment

The experiment was set up to measure tab switch time impact, and this
mod will allow us to see the impact on user memory (and user perception of
memory).

r=mbelshe
Review URL: http://codereview.chromium.org/8027

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@3696 0039d316-1c4b-4281-b951-d872f2087c98

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