Add build rules for dart2js.

Add build rules for dart2js.

Committed: https://code.google.com/p/dart/source/detail?r=5613

[ngeoffray, 2012-03-17 16:00:56]

LGTM

https://chromiumcodereview.appspot.com/9704098/diff/2001/dart/utils/compiler/...
File dart/utils/compiler/build_helper.dart (right):

https://chromiumcodereview.appspot.com/9704098/diff/2001/dart/utils/compiler/...
dart/utils/compiler/build_helper.dart:16: String launcherScript = """
Maybe move this variable into its own method: buildLauncherScript(uri) { }

https://chromiumcodereview.appspot.com/9704098/diff/2001/dart/utils/compiler/...
dart/utils/compiler/build_helper.dart:63: } finally {
Please add a comment that 253 is recognized by test.dart to be a crash.

https://chromiumcodereview.appspot.com/9704098/diff/2001/dart/utils/compiler/...
dart/utils/compiler/build_helper.dart:79: // TODO(ahe): Make scripts executable.
Why not doing it now? Are we missing the API?

[ahe, 2012-03-17 16:16:46]

Thank you, Nicolas.

https://chromiumcodereview.appspot.com/9704098/diff/2001/dart/utils/compiler/...
File dart/utils/compiler/build_helper.dart (right):

https://chromiumcodereview.appspot.com/9704098/diff/2001/dart/utils/compiler/...
dart/utils/compiler/build_helper.dart:16: String launcherScript = """
On 2012/03/17 16:00:56, ngeoffray wrote:
> Maybe move this variable into its own method: buildLauncherScript(uri) { }

Next CL.

https://chromiumcodereview.appspot.com/9704098/diff/2001/dart/utils/compiler/...
dart/utils/compiler/build_helper.dart:63: } finally {
On 2012/03/17 16:00:56, ngeoffray wrote:
> Please add a comment that 253 is recognized by test.dart to be a crash.

Next CL.

https://chromiumcodereview.appspot.com/9704098/diff/2001/dart/utils/compiler/...
dart/utils/compiler/build_helper.dart:79: // TODO(ahe): Make scripts executable.
On 2012/03/17 16:00:56, ngeoffray wrote:
> Why not doing it now? Are we missing the API?

I think there is API for running "chmod +x", but I'll deal with this later; I'm
doing this in steps.

[ahe, 2012-03-17 16:21:37]

https://chromiumcodereview.appspot.com/9704098/diff/2001/dart/utils/compiler/...
File dart/utils/compiler/build_helper.dart (right):

https://chromiumcodereview.appspot.com/9704098/diff/2001/dart/utils/compiler/...
dart/utils/compiler/build_helper.dart:79: // TODO(ahe): Make scripts executable.
On 2012/03/17 16:16:46, ahe wrote:
> On 2012/03/17 16:00:56, ngeoffray wrote:
> > Why not doing it now? Are we missing the API?
> 
> I think there is API for running "chmod +x", but I'll deal with this later;
I'm
> doing this in steps.

Adding a little more insight into my thinking: running "chmod +x" will not work
on Windows, but I'm hooking this up to the build system now. So I'm being
conservative to avoid breaking Windows builds.