Add dev_compiler to the SDK build process.

Add dev_compiler to the SDK build process.

Also update DEPS to bring the latest dev_compiler into the SDK.

This is a second attempt at
https://codereview.chromium.org/1777173003, with the following fixes:

- Added .bat files for Windows.

- Added missing dependency: create_sdk_internal depends on
  dartdevc.dart.snapshot.

- Used pkg_files.stamp to note the source code dependency for
  dartdevc, so that we don't go beyond xcodebuild's input length
  limit.

R=jmesserly@google.com

Committed: https://github.com/dart-lang/sdk/commit/b73e02db49a237e8e9031952c19eb74e9cd8feb8

[Paul Berry, 2016-03-18 19:59:38]

paulberry@google.com changed reviewers:
+ jmesserly@google.com, whesse@chromium.org

[Paul Berry, 2016-03-18 19:59:38]

Tested on Windows, Mac, and Linux.

[Jennifer Messerly, 2016-03-18 20:02:47]

lgtm! Thank you soooo much!

[Paul Berry, 2016-03-18 20:09:14]

Description was changed from

==========
Add dev_compiler to the SDK build process.

Also update DEPS to bring the latest dev_compiler into the SDK.

This is a second attempt at
https://codereview.chromium.org/1777173003, with the following fixes:

- Added .bat files for Windows.

- Added missing dependency: create_sdk_internal depends on
  dartdevc.dart.snapshot.

- Used pkg_files.stamp to note the source code dependency for
  dartdevc, so that we don't go beyond xcodebuild's input length
  limit.
==========

to

==========
Add dev_compiler to the SDK build process.

Also update DEPS to bring the latest dev_compiler into the SDK.

This is a second attempt at
https://codereview.chromium.org/1777173003, with the following fixes:

- Added .bat files for Windows.

- Added missing dependency: create_sdk_internal depends on
  dartdevc.dart.snapshot.

- Used pkg_files.stamp to note the source code dependency for
  dartdevc, so that we don't go beyond xcodebuild's input length
  limit.

R=jmesserly@google.com

Committed:
https://github.com/dart-lang/sdk/commit/b73e02db49a237e8e9031952c19eb74e9cd8feb8
==========

[Paul Berry, 2016-03-18 20:09:17]

Committed patchset #1 (id:1) manually as
b73e02db49a237e8e9031952c19eb74e9cd8feb8 (presubmit successful).