Subclass CachedFont for SVG fonts

Subclass CachedFont for SVG fonts
https://bugs.webkit.org/show_bug.cgi?id=138686

Reviewed by Simon Fraser.

Source/WebCore:

CachedFont had many #if ENABLE(SVG_FONTS) scattered throughout it.
Splitting out this SVG-specific code into a subclass of CachedFont
cleans up the design.

No new tests because there is no behavior change.

* CMakeLists.txt:
* WebCore.vcxproj/WebCore.vcxproj:
* WebCore.vcxproj/WebCore.vcxproj.filters:
* WebCore.xcodeproj/project.pbxproj:
* css/CSSFontFaceSource.cpp:
(WebCore::CSSFontFaceSource::getFontData): There are two sections
in this function; one for SVG fonts and one for regular fonts.
I've moved these two sections into CachedFont and SVGCachedFont,
thereby simplifying this function.
(WebCore::CSSFontFaceSource::ensureFontData): Ditto.
(WebCore::CSSFontFaceSource::svgFontFaceElement): Moved to header.
(WebCore::CSSFontFaceSource::setSVGFontFaceElement): Ditto.
(WebCore::CSSFontFaceSource::isSVGFontFaceSource): Ditto.
* css/CSSFontFaceSource.h: Put functions that are simple enough to
be inlined here.
* css/CSSFontFaceSrcValue.cpp:
(WebCore::CSSFontFaceSrcValue::isSVGFontTarget): Convenience
function.
(WebCore::CSSFontFaceSrcValue::cachedFont): Pass through a boolean
from CSSFontSelector to CachedResourceHandle regarding if we should
be using SVGCachedFont instead of CachedFont.
* css/CSSFontFaceSrcValue.h: New convenience function.
* css/CSSFontSelector.cpp:
(WebCore::CSSFontSelector::addFontFaceRule): Pass through a boolean
* inspector/InspectorPageAgent.cpp:
(WebCore::InspectorPageAgent::cachedResourceType): Update for new
CachedResource type
(WebCore::cachedResourcesForFrame): Ditto.
* loader/cache/CachedFont.cpp:
(WebCore::CachedFont::CachedFont):
(WebCore::CachedFont::ensureCustomFontData): Taken from
CSSFontFaceSource::getFontData()
(WebCore::CachedFont::getFontData): Ditto.
(WebCore::CachedFont::platformDataFromCustomData): Ditto.
(WebCore::CachedFont::ensureSVGFontData): Moved to SVGCachedFont.
(WebCore::CachedFont::getSVGFontById): Ditto.
* loader/cache/CachedFont.h:
* loader/cache/CachedResource.cpp:
(WebCore::defaultPriorityForResourceType): Update for new enum
type.
* loader/cache/CachedResource.h:
* loader/cache/CachedResourceLoader.cpp:
(WebCore::createResource): Takes new boolean.
(WebCore::CachedResourceLoader::requestFont): Ditto.
(WebCore::CachedResourceLoader::checkInsecureContent): Update for
new enum type
(WebCore::CachedResourceLoader::canRequest): Ditto.
* loader/cache/CachedResourceLoader.h:
* loader/cache/CachedSVGFont.cpp: Added.
(WebCore::CachedSVGFont::CachedSVGFont): Moved from
CSSFontFaceSource::getFontData() and CachedFont
(WebCore::CachedSVGFont::getFontData): Ditto.
(WebCore::CachedSVGFont::platformDataFromCustomData): Ditto.
(WebCore::CachedSVGFont::ensureCustomFontData): Ditto.
(WebCore::CachedSVGFont::getSVGFontById): Ditto.
(WebCore::CachedSVGFont::firstFontFace): Ditto.
* loader/cache/CachedSVGFont.h: Subclass CachedFont.
* loader/cache/MemoryCache.cpp:
(WebCore::MemoryCache::getStatistics): Update for new enum.
* svg/SVGFontFaceUriElement.cpp:
(WebCore::isSVGFontTarget): Convenience function.
(WebCore::SVGFontFaceUriElement::loadFont): Update for new
boolean.

Source/WebKit2:

Update for enum type.

* WebProcess/Network/WebResourceLoadScheduler.cpp:
(WebKit::maximumBufferingTime):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@176264 268f45cc-cd09-0410-ab3c-d52691b4dbfc