Revert of [debugger api] remove legacy JSON debug protocol.

Revert of [debugger api] remove legacy JSON debug protocol. (patchset #2 id:20001 of https://codereview.chromium.org/2642253005/ )

Reason for revert:
Node.js relies on this

Original issue's description:
> [debugger api] remove legacy JSON debug protocol.
> 
> R=jgruber@chromium.org
> BUG=v8:5530
> 
> Review-Url: https://codereview.chromium.org/2642253005
> Cr-Commit-Position: refs/heads/master@{#42543}
> Committed: https://chromium.googlesource.com/v8/v8/+/e26a58e43c51a680a0a6363e0066886f4971a41f

TBR=jgruber@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:5530
Review-Url: https://codereview.chromium.org/2644233003
Cr-Commit-Position: refs/heads/master@{#42549}
Committed: https://chromium.googlesource.com/v8/v8/+/7e420cf186c1422b07b2b8458ad98a53275658c7

[Yang, 2017-01-20 11:29:48]

The CQ bit was checked by yangguo@chromium.org

[Yang, 2017-01-20 11:29:48]

Created Revert of [debugger api] remove legacy JSON debug protocol.

[commit-bot: I haz the power, 2017-01-20 11:29:59]

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, 2017-01-20 11:30:07]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1484911788334730, "parent_rev":
"dd8881a5c406496427e4ba794b651af8ed3de213", "commit_rev":
"7e420cf186c1422b07b2b8458ad98a53275658c7"}

[commit-bot: I haz the power, 2017-01-20 11:30:11]

Description was changed from

==========
Revert of [debugger api] remove legacy JSON debug protocol. (patchset #2
id:20001 of https://codereview.chromium.org/2642253005/ )

Reason for revert:
Node.js relies on this

Original issue's description:
> [debugger api] remove legacy JSON debug protocol.
> 
> R=jgruber@chromium.org
> BUG=v8:5530
> 
> Review-Url: https://codereview.chromium.org/2642253005
> Cr-Commit-Position: refs/heads/master@{#42543}
> Committed:
https://chromium.googlesource.com/v8/v8/+/e26a58e43c51a680a0a6363e0066886f497...

TBR=jgruber@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:5530
==========

to

==========
Revert of [debugger api] remove legacy JSON debug protocol. (patchset #2
id:20001 of https://codereview.chromium.org/2642253005/ )

Reason for revert:
Node.js relies on this

Original issue's description:
> [debugger api] remove legacy JSON debug protocol.
> 
> R=jgruber@chromium.org
> BUG=v8:5530
> 
> Review-Url: https://codereview.chromium.org/2642253005
> Cr-Commit-Position: refs/heads/master@{#42543}
> Committed:
https://chromium.googlesource.com/v8/v8/+/e26a58e43c51a680a0a6363e0066886f497...

TBR=jgruber@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:5530

Review-Url: https://codereview.chromium.org/2644233003
Cr-Commit-Position: refs/heads/master@{#42549}
Committed:
https://chromium.googlesource.com/v8/v8/+/7e420cf186c1422b07b2b8458ad98a53275...
==========

[commit-bot: I haz the power, 2017-01-20 11:30:12]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/v8/v8/+/7e420cf186c1422b07b2b8458ad98a53275...