Provide accessor for object internal properties that doesn't require debugger to be active

Provide accessor for object internal properties that doesn't require debugger to be active

Some of the DevTools' clients need to inspect JS objects without enabling debugger. This CL allows to inspect object's internal properties without enabling debugger and instantiating debug context.

Note that now debug context can be created lazily if v8::Debug::GetDebugContext is called when there is no debug listener. This is fragile and has already resulted in some subtle error. I'm going to fix that in a separate CL.

BUG=chromium:481845
LOG=Y

Committed: https://crrev.com/ae6ec1861e7184bce4f45f73db6af355944ef58f
Cr-Commit-Position: refs/heads/master@{#28371}

[yurys, 2015-05-12 15:00:43]

yurys@chromium.org changed reviewers:
+ yangguo@chromium.org

[yurys, 2015-05-12 15:00:43]

This is exact copy of https://crrev.com/bdeb0de88c8cf5f2c78f261b45314138f525110d
 with fix for gcmole applied in PS#2

[Yang, 2015-05-12 15:02:06]

On 2015/05/12 15:00:43, yurys wrote:
> This is exact copy of
https://crrev.com/bdeb0de88c8cf5f2c78f261b45314138f525110d
>  with fix for gcmole applied in PS#2

lgtm

[yurys, 2015-05-12 15:03:06]

The CQ bit was checked by yurys@chromium.org

[commit-bot: I haz the power, 2015-05-12 15:03:12]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1134193002/20001

[commit-bot: I haz the power, 2015-05-12 15:40:36]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-05-12 15:40:51]

Patchset 2 (id:??) landed as
https://crrev.com/ae6ec1861e7184bce4f45f73db6af355944ef58f
Cr-Commit-Position: refs/heads/master@{#28371}