Create a font which can be used for testing font features

Create a font which can be used for testing font features
https://bugs.webkit.org/show_bug.cgi?id=149237

Reviewed by Simon Fraser.

Tools:

This patch adds a new project in the Tools/ directory which generates a font which can
be used for testing font features. This is a standalone project consisting of two files:
1. A file which actually generates the byte vector representing the font. This file has
a single public function: std::vector<uint8_t> generateFont(). This file is not platform
specific, and only relies on the C++ STL.
2. A file with a main() which calls generateFont() and writes out the font, as well as
uses the font to render some demonstration text into a .png file. This file is platform
specific.

The font itself only supports the following characters:
ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
However, the shape of these letters are either an X or a check mark.

The letter "A" always is a check mark.
The letter "B" always is an X.
Without any font features turned on, the rest of the letters are shown as X.

Each font feature has an letter associated with it. When the font feature is enabled,
that letter is shown as a check mark. For example, when "smcp" is enabled, "J" is shown
as a check mark.

Here are the mappings of font features to letters:
liga: C
clig: D
dlig: E
hlig: F
calt: G
subs: H
sups: I
smcp: J
c2sc: K
pcap: L
c2pc: M
unic: N
titl: O
onum: P
pnum: Q
tnum: R
frac: S
afrc: T
ordn: U
zero: V
hist: W
jp78: X
jp83: Y
jp90: Z
jp04: a
smpl: b
trad: c
fwid: d
pwid: e
ruby: f

* FontWithFeatures/FontWithFeatures.xcodeproj/project.pbxproj: Added.
* FontWithFeatures/FontWithFeatures/FontCreator.cpp: Added.
(integralLog2):
(roundDownToPowerOfTwo):
(isFourByteAligned):
(clampTo):
(append32):
(writeCFFEncodedNumber):
(CFFBuilder::CFFBuilder):
(CFFBuilder::takeResult):
(CFFBuilder::moveTo):
(CFFBuilder::lineTo):
(CFFBuilder::curveToCubic):
(CFFBuilder::closePath):
(CFFBuilder::writePoint):
(generateBoxCharString):
(generateCheckCharString):
(generateXCharString):
(charStringForGlyph):
(Generator::generate):
(Generator::Placeholder::Placeholder):
(Generator::Placeholder::populate):
(Generator::Placeholder::~Placeholder):
(Generator::placeholder):
(Generator::append16):
(Generator::append32):
(Generator::append32BitCode):
(Generator::overwrite16):
(Generator::overwrite32):
(Generator::appendCFFTable):
(Generator::appendSubstitutionSubtable):
(Generator::appendScriptSubtable):
(Generator::appendGSUBTable):
(Generator::appendOS2Table):
(Generator::appendFormat12CMAPTable):
(Generator::appendFormat4CMAPTable):
(Generator::appendCMAPTable):
(Generator::appendHEADTable):
(Generator::appendHHEATable):
(Generator::appendHMTXTable):
(Generator::appendMAXPTable):
(Generator::appendNAMETable):
(Generator::appendPOSTTable):
(Generator::calculateChecksum):
(Generator::appendTable):
(generateFont):
* FontWithFeatures/FontWithFeatures/FontCreator.h: Added.
* FontWithFeatures/FontWithFeatures/main.cpp: Added.
(drawTextWithFeature):
(main):

LayoutTests:

* css3/font-feature-settings-rendering-2-expected.html: Added.
* css3/font-feature-settings-rendering-2.html: Added.
* css3/resources/FontWithFeatures.otf: Added.
* platform/efl/TestExpectations:
* platform/win/TestExpectations:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@189890 268f45cc-cd09-0410-ab3c-d52691b4dbfc