A bunch of fixes in idl database generator.

A bunch of fixes in idl database generator.

* Enable SHADOW_DOM
* Add "mediastream" directory to idl search path
* Fix attribute exceptions rendering

R=sra@google.com

Committed: https://code.google.com/p/dart/source/detail?r=4253

[sra1, 2012-02-14 19:56:43]

LGTM.

Are there changes in the generated interfaces?
It is OK to push those as a second CL but it would nice to include them here.

[sra1, 2012-02-14 19:57:57]

On 2012/02/14 19:56:43, sra1 wrote:
> LGTM.
> 
> Are there changes in the generated interfaces?
> It is OK to push those as a second CL but it would nice to include them here.

Should MICRODATA be included - is it in the V8 bindings?

[podivilov, 2012-02-15 08:32:00]

On 2012/02/14 19:57:57, sra1 wrote:
> On 2012/02/14 19:56:43, sra1 wrote:
> > LGTM.
> > 
> > Are there changes in the generated interfaces?
> > It is OK to push those as a second CL but it would nice to include them
here.
> 
> Should MICRODATA be included - is it in the V8 bindings?

Currently MICRODATA is disabled in chrome, see
http://code.google.com/p/chromium/source/search?q=file%3A.gypi+enable_microda....
We can generate Dart interfaces for it, but native callbacks would not compile.