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* Skeleton code of SparseHistogramkaiwang@chromium.org2012-08-091-1/+12
* This is a major refactor of Histogram related code:kaiwang@chromium.org2012-08-011-0/+2
* Add abstract class HistogramBase. It will be the sub class of allkaiwang@chromium.org2012-07-191-0/+14