Sky should expose services provided to/by embedder

Sky should expose services provided to/by embedder

These now appear on internals as takeServicesProvidedToEmbedder and
takeServicesProvidedByEmbedder. When you call these functions, you get back the
raw int that represents the handle. We'll need to wrap them up inside the Dart
VM with the appropriate types. We can create a nice wrapper for that in a
future CL.

R=hansmuller@google.com, hansmuller@chromium.org

Committed: https://chromium.googlesource.com/external/mojo/+/3fa69e975b5a0eb5eb2bd80d78b45cdd52adbda6

[hansmuller1, 2015-02-20 03:08:02]

hansmuller@google.com changed reviewers:
+ hansmuller@google.com

[hansmuller1, 2015-02-20 03:08:02]

LGTM

[abarth-chromium, 2015-02-20 05:16:10]

Committed patchset #1 (id:1) manually as
3fa69e975b5a0eb5eb2bd80d78b45cdd52adbda6 (presubmit successful).