Add implicit constraints from pub onto stack_trace and source_maps.

Add implicit constraints from pub onto stack_trace and source_maps.

These packages are used in pub's plugin isolate, so pub needs to have
a dependency on them to ensure their APIs don't change out from under
it.

R=rnystrom@google.com
BUG=19574
Committed: https://code.google.com/p/dart/source/detail?r=37751

[Bob Nystrom, 2014-06-26 16:37:34]

Couple of nits, but LGTM. This came out really nice.

https://codereview.chromium.org/356523003/diff/1/pkg/source_maps/pubspec.yaml
File pkg/source_maps/pubspec.yaml (right):

https://codereview.chromium.org/356523003/diff/1/pkg/source_maps/pubspec.yaml...
pkg/source_maps/pubspec.yaml:3: # Note! This version is referenced directly in
the pub source code in
"version" -> "version number".

https://codereview.chromium.org/356523003/diff/1/pkg/stack_trace/pubspec.yaml
File pkg/stack_trace/pubspec.yaml (right):

https://codereview.chromium.org/356523003/diff/1/pkg/stack_trace/pubspec.yaml...
pkg/stack_trace/pubspec.yaml:3: # Note! This version is referenced directly in
the pub source code in
Ditto.

https://codereview.chromium.org/356523003/diff/1/sdk/lib/_internal/pub/lib/sr...
File sdk/lib/_internal/pub/lib/src/solver/backtracking_solver.dart (right):

https://codereview.chromium.org/356523003/diff/1/sdk/lib/_internal/pub/lib/sr...
sdk/lib/_internal/pub/lib/src/solver/backtracking_solver.dart:681: var override
= _solver._overrides[depName];
Nice. I didn't remember that the solver already has to track the overrides.

https://codereview.chromium.org/356523003/diff/1/sdk/lib/_internal/pub/lib/sr...
sdk/lib/_internal/pub/lib/src/solver/backtracking_solver.dart:684: // one
exists.
Document that this is mainly for the bots.

https://codereview.chromium.org/356523003/diff/1/sdk/lib/_internal/pub/test/i...
File sdk/lib/_internal/pub/test/implicit_dependency_test.dart (right):

https://codereview.chromium.org/356523003/diff/1/sdk/lib/_internal/pub/test/i...
sdk/lib/_internal/pub/test/implicit_dependency_test.dart:36: "description as a
dependency oerride", () {
"oerride" -> "override". or maybe "o'erride" if you're feeling poetic.

https://codereview.chromium.org/356523003/diff/1/sdk/lib/_internal/pub/test/i...
sdk/lib/_internal/pub/test/implicit_dependency_test.dart:60: d.packagesDir({
Comment that this validates that stack_trace's version is the path one, which
differs from the hosted version.

[nweiz, 2014-06-26 20:03:49]

https://codereview.chromium.org/356523003/diff/1/pkg/source_maps/pubspec.yaml
File pkg/source_maps/pubspec.yaml (right):

https://codereview.chromium.org/356523003/diff/1/pkg/source_maps/pubspec.yaml...
pkg/source_maps/pubspec.yaml:3: # Note! This version is referenced directly in
the pub source code in
On 2014/06/26 16:37:33, Bob Nystrom wrote:
> "version" -> "version number".

Done.

https://codereview.chromium.org/356523003/diff/1/pkg/stack_trace/pubspec.yaml
File pkg/stack_trace/pubspec.yaml (right):

https://codereview.chromium.org/356523003/diff/1/pkg/stack_trace/pubspec.yaml...
pkg/stack_trace/pubspec.yaml:3: # Note! This version is referenced directly in
the pub source code in
On 2014/06/26 16:37:33, Bob Nystrom wrote:
> Ditto.

Done.

https://codereview.chromium.org/356523003/diff/1/sdk/lib/_internal/pub/lib/sr...
File sdk/lib/_internal/pub/lib/src/solver/backtracking_solver.dart (right):

https://codereview.chromium.org/356523003/diff/1/sdk/lib/_internal/pub/lib/sr...
sdk/lib/_internal/pub/lib/src/solver/backtracking_solver.dart:684: // one
exists.
On 2014/06/26 16:37:33, Bob Nystrom wrote:
> Document that this is mainly for the bots.

Done.

https://codereview.chromium.org/356523003/diff/1/sdk/lib/_internal/pub/test/i...
File sdk/lib/_internal/pub/test/implicit_dependency_test.dart (right):

https://codereview.chromium.org/356523003/diff/1/sdk/lib/_internal/pub/test/i...
sdk/lib/_internal/pub/test/implicit_dependency_test.dart:36: "description as a
dependency oerride", () {
On 2014/06/26 16:37:34, Bob Nystrom wrote:
> "oerride" -> "override". or maybe "o'erride" if you're feeling poetic.

Done.

https://codereview.chromium.org/356523003/diff/1/sdk/lib/_internal/pub/test/i...
sdk/lib/_internal/pub/test/implicit_dependency_test.dart:60: d.packagesDir({
On 2014/06/26 16:37:34, Bob Nystrom wrote:
> Comment that this validates that stack_trace's version is the path one, which
> differs from the hosted version.

Done.

[nweiz, 2014-06-26 20:04:11]

Committed patchset #2 manually as r37751 (presubmit successful).