Add last-api.txt for intra-core API.

The initial version of this is the subset of the current intra-core API
which is required for Conscrypt and so must be available on all Android
versions targetted by the Conscrypt mainline module.

This subset was generated by defining a new "stable" intra-core API
and building Conscrypt against that, see http://r.android.com/1200180
for details.

Note that while this change is sufficient to prevent the stable APIs being
removed in a future release, it does not solve the problem of preventing
Conscrypt acquiring dependencies on new intra-core APIs which are not
available on Android 10.  http://r.android.com/1200180 mostly solves
that problem, but at the expense of additional API annotations.

All entries were manually verified as existing in the Android 10
intra-core API, and the behaviour of the methods is unchanged.

Bug: 134485888
Test: make
Change-Id: I46258bda7aeb2d281710446fb8726d62f6912830
1 file changed