https://bugs.webkit.org/show_bug.cgi?id=96979

Reviewed by Dan Bernstein.

Source/WebCore: 

RenderText now uses a String for text.  It keeps a cached LCHar* or UChar* pointer to the
actual text data for performance.  Added a characterAt() indexed accessor to RenderText to avoid the
somewhat confusing construct for a RenderText* rt, e.g. (*re)[n] or rt->characters()[n].  This is
now written as rt->characterAt(n).
Enabled patch in the HTML parser to create 8 bit text data.  Modified TextRun to create 
text runs using 8 bit string data where possible.  Added several flavors of RenderBlock::constructTextRun
to create TextRuns from RenderText objects including with an offset.  Added an LChar flavor of constructTextRun()
as well.  Eliminated the TextRunFlags argument to all but the String flavor as all other flavors used the default
parameter.  
Encased the code that creates 8 bit TextRun's in #if USE(8BIT_TEXTRUN).  Enabled WTF_USE_8BIT_TEXTRUN
for PLATFORM(MAC).  Other platform can update this setting in Platform.h when their platform specific code is
updated to TextRun's with 8 bit data.
Added many 8/16 bit aware paths.  Cleanup up some int / unsigned confusion in RenderBlockLineLayout.cpp.

No function change therefore no new tests.

* html/parser/HTMLTokenizer.cpp:
(WebCore::vectorEqualsString):
(WebCore::HTMLTokenizer::nextToken):
* html/parser/HTMLTokenizer.h:
(HTMLTokenizer):
* html/track/WebVTTTokenizer.cpp:
(WebCore::vectorEqualsString):
(WebCore::WebVTTTokenizer::nextToken):
* html/track/WebVTTTokenizer.h:
(WebVTTTokenizer):
* platform/graphics/Font.h:
(WebCore::Font::glyphDataForCharacter):
* platform/graphics/FontFastPath.cpp:
(WebCore):
* platform/graphics/TextRun.h:
(WebCore::TextRun::TextRun):
(WebCore::TextRun::subRun):
(TextRun):
* platform/graphics/mac/ComplexTextController.cpp:
(WebCore::TextLayout::isNeeded):
(WebCore::TextLayout::constructTextRun):
* rendering/InlineFlowBox.cpp:
(WebCore::InlineFlowBox::placeBoxesInInlineDirection):
* rendering/InlineIterator.h:
(WebCore::InlineIterator::atTextParagraphSeparator):
(WebCore::InlineIterator::current):
(WebCore::InlineIterator::previousInSameNode):
* rendering/InlineTextBox.cpp:
(WebCore::adjustCharactersAndLengthForHyphen):
(WebCore::InlineTextBox::paint):
(WebCore::InlineTextBox::paintSelection):
(WebCore::InlineTextBox::constructTextRun):
* rendering/InlineTextBox.h:
(InlineTextBox):
* rendering/RenderBlock.cpp:
(WebCore::constructTextRunInternal):
(WebCore::RenderBlock::constructTextRun):
* rendering/RenderBlock.h:
(RenderBlock):
* rendering/RenderBlockLineLayout.cpp:
(WebCore::endsWithASCIISpaces):
(WebCore::reachedEndOfTextRenderer):
(WebCore::RenderBlock::computeInlineDirectionPositionsForLine):
(WebCore::shouldSkipWhitespaceAfterStartObject):
(WebCore::textWidth):
(WebCore::tryHyphenating):
(WebCore::RenderBlock::LineBreaker::nextLineBreak):
* rendering/RenderCombineText.cpp:
(WebCore::RenderCombineText::getStringToRender):
(WebCore::RenderCombineText::combineText):
* rendering/RenderCombineText.h:
(RenderCombineText):
* rendering/RenderText.cpp:
(SameSizeAsRenderText):
(WebCore::RenderText::RenderText):
(WebCore::RenderText::widthFromCache):
(WebCore::RenderText::computePreferredLogicalWidths):
(WebCore::RenderText::setTextInternal):
(WebCore::RenderText::width):
* rendering/RenderText.h:
(WebCore::RenderText::is8Bit):
(WebCore::RenderText::characters8):
(WebCore::RenderText::characters16):
(WebCore::RenderText::characterAt):
(WebCore::RenderText::operator[]):
(RenderText):
* xml/parser/MarkupTokenBase.h:
(WebCore::MarkupTokenBase::appendToCharacter):
(MarkupTokenBase):
(WebCore::MarkupTokenBase::isAll8BitData):

Source/WTF: 

Added WTF_USE_8BIT_TEXTRUN to encase code that creates 8 bit TextRun's.  Enabled WTF_USE_8BIT_TEXTRUN
for PLATFORM(MAC).  Other platform can update this setting in Platform.h when their platform specific use of
TextRun handle 8 bit data.  Added a new Vector::appendVector to allow appending the contents of a vector
containing one type to the end of vector containing another.  This is used to append a Vector<LChar> to
the end of a Vector<UChar>.

* wtf/Platform.h:
* wtf/Vector.h:
(Vector):
(WTF::Vector::appendVector):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@131311 268f45cc-cd09-0410-ab3c-d52691b4dbfc