Bug 1016680, part 1 - Report the memory used by RuleCascadeData::mKeyframesRuleTable. r=dholbert

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extra : rebase_source : 97bd8b0ddef514e9eb218eac783c3af892a8014e
Bug 1016680, part 2 - Report the memory used by PresShell::mVisibleImages and PresShell::mFramesToDirty. r=dholbert

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extra : rebase_source : 0d348e97861917c67862271c4c4ee9f51b007255