If library A imports or exports library B (either directly or via an
export), library B needs to be included in the dependency list for
library A's prelinked summary, since a change to library B might change
the meaning of a name which *is* used by library A.
Note that two of the new tests are currently failing, due to the fact
that we aren't tracking dependencies that only affect the export
namespace. That will be fixed in a future CL.
R=scheglov@google.com
Review URL: https://codereview.chromium.org/1580013003 .
Paul Berry
35f3961ea6