[ Merge of http://go/wvgerrit/124004 ]
When the CDM creates a new usage entry for an offline or streaming
license, the new entry is immediately moved to the lowest available
entry index that has been marked as vacant (kStorageTypeUnknown).
When a license is released, its meta data that is managed by the CDM
is cleared; however, the usage entry's index is marked vacant, but it
is not released. This creates wasted entry space in the usage table.
Unfortunately, defragging the table is computationally expensive and
may not be able to actually free up much space depending on when it
is performed.
For a typical user, this will likely not be an issue as the table
can get quite large compared to the number of licenses an app uses
and the table is partially cleaned on each boot.
GTS tests, however, have reached a point where they fill the usage
table before all tests are complete. This is causing many unexpected
failures for devices. Most of these tests release their license, but
the CDM never reaches a state where it can clean up the table.
By moving newly created entries to the lowest available index directly
after creating the entries, the table never needs to grow unless all
entries are in use. Clean up is now almost never required.
Bug: 180639135
Bug: 180638990
Bug: 180638530
Test: MediaDrmTest#testWidevineApi28
Change-Id: I1a68d90d51384094298b27037778747ce7435374
884550333d