Avoid crashing when Runtime_GetFrameDetails is called on a RunMicrotasks stack frame

Avoid crashing when Runtime_GetFrameDetails is called on a RunMicrotasks stack frame

See attached bug for the crash reproduction: it involves three different web
platform features and having the inspector open. Not clear how feasible this
is to turn into a v8 test case.

BUG=385349

[adamk, 2014-06-19 22:32:37]

As noted in the patch description, I'm not sure how easy this is to test inside
v8. I only see one mention of %GetFrameDetails under test...any suggestions for
testing would be appreciated.

[Yang, 2014-06-23 11:17:00]

On 2014/06/19 22:32:37, adamk wrote:
> As noted in the patch description, I'm not sure how easy this is to test
inside
> v8. I only see one mention of %GetFrameDetails under test...any suggestions
for
> testing would be appreciated.

I have an alternative solution: https://codereview.chromium.org/332923003/

[adamk, 2014-06-23 17:51:22]

On 2014/06/23 at 11:17:00, yangguo wrote:
> On 2014/06/19 22:32:37, adamk wrote:
> > As noted in the patch description, I'm not sure how easy this is to test
inside
> > v8. I only see one mention of %GetFrameDetails under test...any suggestions
for
> > testing would be appreciated.
> 
> I have an alternative solution: https://codereview.chromium.org/332923003/

Great, I like your solution better too.