Implements document.lastModified for #2972

[ghost]

No description provided.

[hoppipolla-critic-bot]

Critic review: https://critic.hoppipolla.co.uk/r/2414

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[jdm]

Thanks @mechaxl! I've left some comments on Critic that should be addressed.

[jdm]

Summary
=======

Ran 3788 tests (364 parents, 3424 subtests)
Expected results: 3784
Unexpected results: 4 (FAIL: 1, PASS: 3)

Unexpected Results
==================

/html/dom/documents/resource-metadata-management/document-lastModified.html
---------------------------------------------------------------------------
PASS expected FAIL lastModified should return the last modified date and time

/html/dom/documents/resource-metadata-management/document-lastModified-01.html
------------------------------------------------------------------------------
PASS expected FAIL Date returned by lastModified is in the user's local time zone.
PASS expected FAIL Date returned by lastModified is in the form "MM/DD/YYYY hh:mm:ss".
FAIL Date returned by lastModified is current.

[jdm]

The ini file for document-lastModified will need to be updated to account for the updated test results.

[ghost]

@jdm, where is the ini file located at?

[jdm]

http://mxr.mozilla.org/servo/source/src/test/wpt/metadata/html/dom/documents/resource-metadata-management/document-lastModified.html.ini

[jdm]

Great! Let's wait for Travis to go green, and then I'd like to squash everything together into a single commit.

[Ms2ger]

@mechaxl, thanks a lot! I squashed your commits and landed them over in #3204.

[jdm]

In that case, let's close this PR.