Reviewed by Dan Bernstein.

    Reviewed by Dan Bernstein.

        Make textarea and text input metrics more closely match IEs.
        https://bugs.webkit.org/show_bug.cgi?id=15312

        This involves:
        -set text input width to size*avgCharWidth + maxCharWidth - avgCharWidth
        -set textarea width to cols*avgCharWidth
        -Make default CSS match IEs
        -Correctly initializing m_avgCharWidth and m_maxCharWidth for each platform and SVG.

        Those values for textarea and inputs were derived by doing a ton of manual
        testing of IE's width values for various textareas and fonts.

        To get the average and max character width of a font, we do the following
        for each platform:
        -Win: TextMetrics expose avgCharWidth and maxCharWidth
        -SVG: avgCharWidth = width of an '0', fallback on width of a space glyph, then m_xHeight
            maxCharWidth = width of a 'W' for roman fonts, fallback on m_ascent
        -Linux: avgCharWidth = width of an '0', fallback on m_xHeight
            maxCharWidth = max of avgCharWidth and m_ascent
        -Mac: look in the OS/2 table for avgCharWidth and grab the maxCharWidth off the font.
            If either one is not there, then calculate the value using the Linux approach.

        Linux ports could probably dig into the OS/2 table as well, but I'll leave
        that up to them to implement.

        Tests: fast/forms/text-control-intrinsic-widths.html
               fast/forms/textarea-metrics.html
               svg/custom/svg-fonts-in-text-controls.html

        * css/html4.css:
        * css/themeWin.css:
        * platform/graphics/SimpleFontData.cpp:
        (WebCore::SimpleFontData::SimpleFontData):
        (WebCore::SimpleFontData::initCharWidths):
        * platform/graphics/SimpleFontData.h:
        (WebCore::SimpleFontData::maxCharWidth):
        (WebCore::SimpleFontData::avgCharWidth):
        * platform/graphics/chromium/SimpleFontDataChromiumWin.cpp:
        (WebCore::SimpleFontData::platformCharWidthInit):
        * platform/graphics/chromium/SimpleFontDataLinux.cpp:
        (WebCore::SimpleFontData::platformCharWidthInit):
        * platform/graphics/gtk/SimpleFontDataGtk.cpp:
        (WebCore::SimpleFontData::platformCharWidthInit):
        * platform/graphics/gtk/SimpleFontDataPango.cpp:
        (WebCore::SimpleFontData::platformCharWidthInit):
        * platform/graphics/mac/SimpleFontDataMac.mm:
        (WebCore::SimpleFontData::platformCharWidthInit):
        * platform/graphics/qt/SimpleFontDataQt.cpp:
        (WebCore::SimpleFontData::platformCharWidthInit):
        * platform/graphics/win/SimpleFontDataCGWin.cpp:
        (WebCore::SimpleFontData::platformCharWidthInit):
        * platform/graphics/win/SimpleFontDataCairoWin.cpp:
        (WebCore::SimpleFontData::platformInit):
        (WebCore::SimpleFontData::platformCharWidthInit):
        * platform/graphics/win/SimpleFontDataWin.cpp:
        (WebCore::SimpleFontData::initGDIFont):
        * platform/graphics/wx/SimpleFontDataWx.cpp:
        (WebCore::SimpleFontData::platformCharWidthInit):
        * rendering/RenderTextControl.cpp:
        (WebCore::RenderTextControl::calcPrefWidths):
        * rendering/RenderTextControlMultiLine.cpp:
        (WebCore::RenderTextControlMultiLine::createInnerTextStyle):
        * rendering/RenderTextControlSingleLine.cpp:
        (WebCore::RenderTextControlSingleLine::preferredContentWidth):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@42678 268f45cc-cd09-0410-ab3c-d52691b4dbfc