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- This directory contains process-independent code for recording metrics bucketed
- by the number of tabs or the number of live tabs.
- We consider a tab to be alive (i.e. a live tab) if it is a UI tab (e.g. in a
- tabstrip, as opposed to a prerenderer), and it has not been discarded and has
- not crashed. Tabs can be discarded on desktop by TabManager to conserve
- resources, and tabs crash when the corresponding renderer process is killed,
- e.g. due to limited resources (OOM).
- Clients of this component must be able to count live tabs. The interface this
- component exposes provides a way to help create metrics bucketed by live/ or all
- tab count in a consistent manner, but this is dependent on the client knowing
- the count. The code in this directory is meant to be shared between processes,
- and so we do not count tabs here. The tab count is a browser concept, and it can
- be computed there. To record metrics bucketed by tab counts in processes other
- than the browser, the tab count would need to be plumbed out of the browser. In
- some cases this may be more efficient than plumbing metrics data out of the
- process to the browser, which is an alternative.
- This component should not have any dependencies other than //base as it
- should be able to be used from any other place.
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