Test dependency tracking of unused imports/exports.

Test dependency tracking of unused imports/exports.

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

Committed: https://github.com/dart-lang/sdk/commit/35f3961ea6e8cb3e82bee31b17ec1ec331ad8dab

[Paul Berry, 2016-01-12 20:07:08]

paulberry@google.com changed reviewers:
+ scheglov@google.com

[scheglov, 2016-01-12 20:10:09]

LGTM

[Paul Berry, 2016-01-13 16:17:53]

Description was changed from

==========
Test dependency tracking of unused imports/exports.

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.
==========

to

==========
Test dependency tracking of unused imports/exports.

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

Committed:
https://github.com/dart-lang/sdk/commit/35f3961ea6e8cb3e82bee31b17ec1ec331ad8dab
==========

[Paul Berry, 2016-01-13 16:17:54]

Committed patchset #1 (id:1) manually as
35f3961ea6e8cb3e82bee31b17ec1ec331ad8dab (presubmit successful).