Fix submodule dependencies for string cache.
Move Parser creation to its own function (issue #849).

This is the first step to implement innerHTML, as we need a way
create and initialize a parser object while setting the received
DOMString (which may be either text/html/whatever).
Merge pull request #2901 from Adenilson/innerHTML-step01b

Move Parser creation to its own function (issue #849).
Bump submodules for azure/skia with fixes for xvfb.
Merge pull request #2899 from glennw/fix-deps

Fix submodule dependencies for string cache.
Merge pull request #2902 from glennw/xvfb-fixes

Bump submodules for azure/skia with fixes for xvfb.