Doug Thayer 6572652a7d Bug 1176019 - Cache layers of background tabs r=mconley ... We maintain a simple LRU cache of tab layers by setting their docShellIsActive = false with preserveLayers(true). Once they are pushed out of the cache by more recently used tabs, their layers are discarded. Luckily most of the complexity of this could be contained in the AsyncTabSwitcher - the one change that had to sit outside of that was moving the aTab.closing = true earlier in the removeTab call, so that we could use that information to eagerly evict tabs from the cache. This was to address a leak in a few tests on try. MozReview-Commit-ID: 2E3uU8LEYkD --HG-- extra : rebase_source : d2865fd1ee10db17d9f41cca059a5cee697f259d		2018-04-16 15:35:41 -07:00
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tabbrowser	Bug 1176019 - Cache layers of background tabs r=mconley	2018-04-16 15:35:41 -07:00