Move more Mojo bindings helpers out of internal namespace

Move more Mojo bindings helpers out of internal namespace

Moves the following things out of the mojo::internal namespace
and moves their headers to mojo/public/cpp/bindings:

  - InterfaceId
  - Message flags (constants in Message rather than in internal)
  - MessageHeaderValidator
  - PipeControlMessageHandler
  - PipeControlMessageHandlerDelegate
  - PipeControlMessageProxy
  - SyncHandleWatcher

This completes the set of existing helpers necessary to implement
custom bindings endpoints with custom routing logic.

BUG=612500
R=yzshen@chromium.org

Committed: https://crrev.com/fb120de586f00981251a9bdfc8f952a4a8f91240
Cr-Commit-Position: refs/heads/master@{#403292}

[yzshen1, 2016-06-30 17:25:52]

lgtm

[Ken Rockot(use gerrit already), 2016-06-30 20:12:56]

The CQ bit was checked by rockot@chromium.org

[Ken Rockot(use gerrit already), 2016-06-30 20:12:57]

The patchset sent to the CQ was uploaded after l-g-t-m from yzshen@chromium.org
Link to the patchset: https://codereview.chromium.org/2114523002/#ps40001
(title: "rebase")

[commit-bot: I haz the power, 2016-06-30 20:13:46]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-06-30 21:23:11]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2016-06-30 21:23:24]

CQ bit was unchecked.

[commit-bot: I haz the power, 2016-06-30 21:24:22]

Description was changed from

==========
Move more Mojo bindings helpers out of internal namespace

Moves the following things out of the mojo::internal namespace
and moves their headers to mojo/public/cpp/bindings:

  - InterfaceId
  - Message flags (constants in Message rather than in internal)
  - MessageHeaderValidator
  - PipeControlMessageHandler
  - PipeControlMessageHandlerDelegate
  - PipeControlMessageProxy
  - SyncHandleWatcher

This completes the set of existing helpers necessary to implement
custom bindings endpoints with custom routing logic.

BUG=612500
R=yzshen@chromium.org
==========

to

==========
Move more Mojo bindings helpers out of internal namespace

Moves the following things out of the mojo::internal namespace
and moves their headers to mojo/public/cpp/bindings:

  - InterfaceId
  - Message flags (constants in Message rather than in internal)
  - MessageHeaderValidator
  - PipeControlMessageHandler
  - PipeControlMessageHandlerDelegate
  - PipeControlMessageProxy
  - SyncHandleWatcher

This completes the set of existing helpers necessary to implement
custom bindings endpoints with custom routing logic.

BUG=612500
R=yzshen@chromium.org

Committed: https://crrev.com/fb120de586f00981251a9bdfc8f952a4a8f91240
Cr-Commit-Position: refs/heads/master@{#403292}
==========

[commit-bot: I haz the power, 2016-06-30 21:24:23]

Patchset 3 (id:??) landed as
https://crrev.com/fb120de586f00981251a9bdfc8f952a4a8f91240
Cr-Commit-Position: refs/heads/master@{#403292}