Add method to html_dartium utils to check for NSM errors

Add method to html_dartium utils to check for NSM errors

BUG=
R=vsm@google.com

Committed: https://code.google.com/p/dart/source/detail?r=25741

[vsm, 2013-08-02 04:09:14]

Is this to invoke from native code?

[Jacob, 2013-08-02 16:54:12]

On 2013/08/02 04:09:14, vsm wrote:
> Is this to invoke from native code?
Yes. Here is the matching CL that uses this helper.
https://codereview.chromium.org/21916002/

[vsm, 2013-08-02 19:58:36]

lgtm

We're using this pattern in a few places, but adding asiva to think about
whether we should do this kind of thing natively.

[Jacob, 2013-08-02 20:07:04]

Committed patchset #1 manually as r25741 (presubmit successful).

[siva, 2013-08-02 22:16:55]

On 2013/08/02 19:58:36, vsm wrote:
> lgtm
> 
> We're using this pattern in a few places, but adding asiva to think about
> whether we should do this kind of thing natively.

Is this in a hot frequently used path?
It makes sense to add a native method to the API if it is used a lot.

[Jacob, 2013-08-02 22:20:26]

On 2013/08/02 22:16:55, siva wrote:
> On 2013/08/02 19:58:36, vsm wrote:
> > lgtm
> > 
> > We're using this pattern in a few places, but adding asiva to think about
> > whether we should do this kind of thing natively.
> 
> Is this in a hot frequently used path?
> It makes sense to add a native method to the API if it is used a lot.

It is a hot path for the Developer tools and in the near future for JS interop.