Partially revert notification of package map computation

Partially revert notification of package map computation

R=paulberry@google.com, scheglov@google.com

Committed: https://github.com/dart-lang/sdk/commit/954d61f3633888c4e3acb3f027670475b4417cb8

[Brian Wilkerson, 2016-02-29 22:02:54]

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

[Brian Wilkerson, 2016-02-29 22:02:55]

As Paul pointed out, the previous CL changed the semantics more than intended
because streams are asynchronous. It looks like we'll need to retain the
callback interface, but the new plan is to make it purely informational in the
sense that ContextManager won't care whether the call backs actually do
anything.

[scheglov, 2016-02-29 22:06:55]

LGTM

[Paul Berry, 2016-02-29 22:29:38]

lgtm

[Brian Wilkerson, 2016-02-29 22:37:04]

Description was changed from

==========
Partially revert notification of package map computation
==========

to

==========
Partially revert notification of package map computation

R=paulberry@google.com, scheglov@google.com

Committed:
https://github.com/dart-lang/sdk/commit/954d61f3633888c4e3acb3f027670475b4417cb8
==========

[Brian Wilkerson, 2016-02-29 22:37:06]

Committed patchset #1 (id:1) manually as
954d61f3633888c4e3acb3f027670475b4417cb8 (presubmit successful).