Allow caller of application_snapshot to override .packages

Allow caller of application_snapshot to override .packages.

This will be used in flutter engine to build snapshot of frontend server dart app.

BUG=
R=zra@google.com

Committed: https://github.com/dart-lang/sdk/commit/e25898d963615091e66dafa08e91caf9e6232086

[aam, 2017-08-15 16:42:57]

Description was changed from

==========
Allow caller of application_snapshot to override .packages

BUG=
==========

to

==========
Allow caller of application_snapshot to override .packages.

This will be used in flutter engine to build snapshot of frontend server dart
app.

BUG=
==========

[aam, 2017-08-15 16:42:57]

aam@google.com changed reviewers:
+ zra@google.com

[aam, 2017-08-15 22:29:00]

PTAL, thanks!

[zra, 2017-08-15 22:34:08]

lgtm w/ slight re-org.

https://codereview.chromium.org/2995053002/diff/1/utils/application_snapshot.gni
File utils/application_snapshot.gni (right):

https://codereview.chromium.org/2995053002/diff/1/utils/application_snapshot....
utils/application_snapshot.gni:34: }
Maybe move the logic up here with the logic for the other parameters.

[aam, 2017-08-15 23:07:26]

https://codereview.chromium.org/2995053002/diff/1/utils/application_snapshot.gni
File utils/application_snapshot.gni (right):

https://codereview.chromium.org/2995053002/diff/1/utils/application_snapshot....
utils/application_snapshot.gni:34: }
On 2017/08/15 22:34:07, zra wrote:
> Maybe move the logic up here with the logic for the other parameters.

Done.

[aam, 2017-08-15 23:10:24]

Description was changed from

==========
Allow caller of application_snapshot to override .packages.

This will be used in flutter engine to build snapshot of frontend server dart
app.

BUG=
==========

to

==========
Allow caller of application_snapshot to override .packages.

This will be used in flutter engine to build snapshot of frontend server dart
app.

BUG=
R=zra@google.com

Committed:
https://github.com/dart-lang/sdk/commit/e25898d963615091e66dafa08e91caf9e6232086
==========

[aam, 2017-08-15 23:10:26]

Committed patchset #2 (id:20001) manually as
e25898d963615091e66dafa08e91caf9e6232086 (presubmit successful).