Add hook for compiling to JavaScript.

Add hook for compiling to JavaScript.

R=kasperl@google.com

Committed: https://code.google.com/p/dart/source/detail?r=42984

[ahe, 2015-01-19 10:32:28]

ahe@google.com changed reviewers:
+ kasperl@google.com

[kasperl, 2015-01-19 11:21:04]

LGTM.

https://codereview.chromium.org/858843002/diff/1/dart/pkg/dart2js_incremental...
File dart/pkg/dart2js_incremental/lib/server.dart (right):

https://codereview.chromium.org/858843002/diff/1/dart/pkg/dart2js_incremental...
dart/pkg/dart2js_incremental/lib/server.dart:61: // Ignored.
What kind of exception can happen here and why are they being ignored?

[ahe, 2015-01-19 11:37:13]

Thank you, Kasper!

https://codereview.chromium.org/858843002/diff/1/dart/pkg/dart2js_incremental...
File dart/pkg/dart2js_incremental/lib/server.dart (right):

https://codereview.chromium.org/858843002/diff/1/dart/pkg/dart2js_incremental...
dart/pkg/dart2js_incremental/lib/server.dart:61: // Ignored.
On 2015/01/19 11:21:04, kasperl wrote:
> What kind of exception can happen here and why are they being ignored?

The kind of exception isn't specified. All that is specified is:

   * The response headers can be modified until the response body is
   * written to or closed. After that they become immutable.

However, I'm not using this method, so I'll delete it.

[ahe, 2015-01-19 11:37:33]

Committed patchset #2 (id:20001) manually as 42984 (presubmit successful).