700ee5160a
[ Merge of http://go/wvgerrit/65983 ] Add support to drop closed metrics in order to save space for long-running applications (and CdmEngine instances). The code now keeps only a limited number of metrics collections after the session is closed. As a session (and its metrics session) is closed, the oldest, closed metrics session is dropped. This means those metrics will not be reported nor accessible in the client. Bug: http://b/118664842 Test: CDM Unit tests. Android Unit Test. Ran GPLay Manually. Change-Id: I27d6e61a8fe4148ad1ef2a433c8e5f4cdd84cc72