https://bugs.webkit.org/show_bug.cgi?id=97740

Reviewed by Darin Adler.

Source/WebCore: 

Changed parserAppendData to take a string instead of a UChar*.  Also added an optional offset
argument to handle string+offset.  The actual string append now uses the appropriate string
size.

* dom/CharacterData.cpp:
(WebCore::CharacterData::parserAppendData):
* dom/CharacterData.h:
(CharacterData):
* dom/Text.cpp:
(WebCore::Text::createWithLengthLimit):
* html/parser/HTMLConstructionSite.cpp:
(WebCore::HTMLConstructionSite::insertTextNode):

Source/WTF: 

Added an append method that takes an LChar source.  Made both the UChar and LChar versions optimally handle
the appendee and appendend string bitness.

* wtf/text/WTFString.cpp:
(WTF::String::append):
* wtf/text/WTFString.h:
(String):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@130190 268f45cc-cd09-0410-ab3c-d52691b4dbfc