[fenix] For https://github.com/mozilla-mobile/fenix/issues/7820: warm BrowsersCache on background thread.
In an early iteration of his patch on a beta build, I saw no improvement over 6 runs (Pixel 2): - Before: 401.5ms - After: 402.17ms This may be attributed to noise in startup performance. However, BrowsersCache disappears from profiles completely and results in theoretical performance gains. When using the StartupTimeline class (not landed yet), I see a 27.75ms runtime improvement on beta builds after this patch.pull/600/head
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