Add histograms for total allocated/live heap size, as well as allocated size and percentage of total for map and cell

BUG=none
TEST=none
R=mstarzinger@chromium.org

Review URL: https://chromiumcodereview.appspot.com/10854043
Patch from Jochen Eisinger <jochen@chromium.org>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12291 ce2b1a6d-e550-0410-aec6-3dcde31c8c00