[inspector] Move SetIdle from CPUProfiler to debug-interface

[inspector] Move SetIdle from CPUProfiler to debug-interface

Idleness is a per-isolate state and should be communicated once,
not for every CPUProfiler instance.

BUG=none

[dgozman, 2017-05-24 22:48:10]

dgozman@chromium.org changed reviewers:
+ alph@chromium.org, jgruber@chromium.org

[dgozman, 2017-05-24 22:48:11]

Could you please take a look?

[alph, 2017-05-25 22:20:30]

lgtm

[dgozman, 2017-05-26 19:39:33]

Jakob, could you please take a look?

[jgruber, 2017-05-29 07:45:25]

lgtm

Sorry for the delay, I was out of town during holidays.

[dgozman, 2017-05-31 00:09:00]

The CQ bit was checked by dgozman@chromium.org

[dgozman, 2017-05-31 00:09:00]

The patchset sent to the CQ was uploaded after l-g-t-m from alph@chromium.org,
jgruber@chromium.org
Link to the patchset: https://codereview.chromium.org/2896303004/#ps20001
(title: "rebased")

[commit-bot: I haz the power, 2017-05-31 00:09:11]

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, 2017-05-31 01:16:22]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2017-05-31 01:16:23]

Try jobs failed on following builders:
  v8_linux_dbg_ng on master.tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux_dbg_ng/builds/26713)
  v8_linux_dbg_ng_triggered on master.tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux_dbg_ng_triggered/b...)

[dgozman, 2017-05-31 18:56:03]

For some reason, this fails due to DCHECK - we are calling SetIdle while VMState
is JS. Reproduces consistently, I will take a look later. For now, postponing
the patch.