[Re-land] Add FontFaceDescriptors IDL dictionary

This is an attempt to re-land r181610. The CL was reverted due to build breakage, but I couldn't reproduce the link error.

TBR=haraken@chromium.org,keishi@chromium.org

The original description:

Add FontFaceDescriptors IDL dictionary

To follow the spec[1]. This is the first place to use IDL dictionary
execept for testing, so this CL also includes build related changes.
Existing tests(e.g. fast/css/fontface-constructor-error.html) should
cover this change.

[1] http://dev.w3.org/csswg/css-font-loading/#fontface-interface

BUG=403150
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=181610

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=181631

[bashi, 2014-09-09 08:43:26]

bashi@chromium.org changed reviewers:
+ haraken@chromium.org, keishi@chromium.org, ksakamoto@chromium.org

[bashi, 2014-09-09 08:43:46]

The CQ bit was checked by bashi@chromium.org

[commit-bot: I haz the power, 2014-09-09 08:44:11]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/bashi@chromium.org/556543003/1

[haraken, 2014-09-09 08:47:35]

LGTM

[commit-bot: I haz the power, 2014-09-09 10:31:39]

Committed patchset #1 (id:1) as 181631

[keishi, 2014-09-09 11:05:27]

On 2014/09/09 10:31:39, I haz the power (commit-bot) wrote:
> Committed patchset #1 (id:1) as 181631

The first build after it landed failed again
http://build.chromium.org/p/chromium.webkit/builders/GPU%20Mac%20Builder/buil...
But it seems to have succeeded on its second try, so I think it is ok.
http://build.chromium.org/p/chromium.webkit/builders/GPU%20Mac%20Builder/buil...

Sorry for the trouble.

[bashi, 2014-09-09 11:13:51]

On 2014/09/09 11:05:27, keishi wrote:
> On 2014/09/09 10:31:39, I haz the power (commit-bot) wrote:
> > Committed patchset #1 (id:1) as 181631
> 
> The first build after it landed failed again
>
http://build.chromium.org/p/chromium.webkit/builders/GPU%20Mac%20Builder/buil...
> But it seems to have succeeded on its second try, so I think it is ok.
>
http://build.chromium.org/p/chromium.webkit/builders/GPU%20Mac%20Builder/buil...
> 
> Sorry for the trouble.

Thank you for handling the trouble! Feel free to re-revert if needed:)