Reviewed by Andreas Kling.

        GraphicsContext: Merge m_common and m_data
        https://bugs.webkit.org/show_bug.cgi?id=49914

        Move data members from GraphicsContextPrivate into GraphicsContext. So GraphicsContextPlatform.h
        and m_common became unnecessary. They are removed.
        Add two methods to GraphicsContext: platformInit() and platformDestroy(), which
        make the constructor of GraphicsContext clearer.
        Besides add a getter to the private GraphicsContext::m_state member, because some inline
        functions in cairo need it.

        No new test is needed, because this is a refactoring.

        * WebCore.xcodeproj/project.pbxproj:
        * platform/graphics/GraphicsContext.cpp:
        (WebCore::GraphicsContext::GraphicsContext):
        (WebCore::GraphicsContext::~GraphicsContext):
        (WebCore::GraphicsContext::save):
        (WebCore::GraphicsContext::restore):
        (WebCore::GraphicsContext::setStrokeThickness):
        (WebCore::GraphicsContext::setStrokeStyle):
        (WebCore::GraphicsContext::setStrokeColor):
        (WebCore::GraphicsContext::setShadow):
        (WebCore::GraphicsContext::clearShadow):
        (WebCore::GraphicsContext::getShadow):
        (WebCore::GraphicsContext::strokeThickness):
        (WebCore::GraphicsContext::strokeStyle):
        (WebCore::GraphicsContext::strokeColor):
        (WebCore::GraphicsContext::strokeColorSpace):
        (WebCore::GraphicsContext::fillRule):
        (WebCore::GraphicsContext::setFillRule):
        (WebCore::GraphicsContext::setFillColor):
        (WebCore::GraphicsContext::fillColor):
        (WebCore::GraphicsContext::fillColorSpace):
        (WebCore::GraphicsContext::setShouldAntialias):
        (WebCore::GraphicsContext::shouldAntialias):
        (WebCore::GraphicsContext::state):
        (WebCore::GraphicsContext::setStrokePattern):
        (WebCore::GraphicsContext::setFillPattern):
        (WebCore::GraphicsContext::setStrokeGradient):
        (WebCore::GraphicsContext::setFillGradient):
        (WebCore::GraphicsContext::fillGradient):
        (WebCore::GraphicsContext::strokeGradient):
        (WebCore::GraphicsContext::fillPattern):
        (WebCore::GraphicsContext::strokePattern):
        (WebCore::GraphicsContext::setShadowsIgnoreTransforms):
        (WebCore::GraphicsContext::updatingControlTints):
        (WebCore::GraphicsContext::setUpdatingControlTints):
        (WebCore::GraphicsContext::setPaintingDisabled):
        (WebCore::GraphicsContext::paintingDisabled):
        (WebCore::GraphicsContext::textDrawingMode):
        (WebCore::GraphicsContext::setTextDrawingMode):
        * platform/graphics/GraphicsContext.h:
        (WebCore::GraphicsContextState::GraphicsContextState):
        * platform/graphics/GraphicsContextPrivate.h: Removed.
        * platform/graphics/cairo/GraphicsContextCairo.cpp:
        (WebCore::setPlatformFill):
        (WebCore::setPlatformStroke):
        (WebCore::drawPathShadow):
        (WebCore::fillCurrentCairoPath):
        (WebCore::strokeCurrentCairoPath):
        (WebCore::GraphicsContext::platformInit):
        (WebCore::GraphicsContext::platformDestroy):
        (WebCore::GraphicsContext::fillPath):
        (WebCore::GraphicsContext::strokePath):
        (WebCore::GraphicsContext::fillRect):
        (WebCore::GraphicsContext::setPlatformShadow):
        (WebCore::GraphicsContext::strokeRect):
        (WebCore::GraphicsContext::setAlpha):
        (WebCore::GraphicsContext::getAlpha):
        * platform/graphics/cg/GraphicsContextCG.cpp:
        (WebCore::GraphicsContext::platformInit):
        (WebCore::GraphicsContext::platformDestroy):
        (WebCore::GraphicsContext::applyStrokePattern):
        (WebCore::GraphicsContext::applyFillPattern):
        (WebCore::GraphicsContext::drawPath):
        (WebCore::GraphicsContext::fillPath):
        (WebCore::GraphicsContext::strokePath):
        (WebCore::GraphicsContext::fillRect):
        (WebCore::GraphicsContext::setPlatformShadow):
        (WebCore::GraphicsContext::strokeRect):
        * platform/graphics/haiku/GraphicsContextHaiku.cpp:
        (WebCore::GraphicsContext::platformInit):
        (WebCore::GraphicsContext::platformDestroy):
        * platform/graphics/openvg/GraphicsContextOpenVG.cpp:
        (WebCore::GraphicsContext::platformInit):
        (WebCore::GraphicsContext::platformDestroy):
        (WebCore::GraphicsContext::fillPath):
        (WebCore::GraphicsContext::strokePath):
        (WebCore::GraphicsContext::clip):
        (WebCore::GraphicsContext::clipOut):
        (WebCore::GraphicsContext::addInnerRoundedRectClip):
        * platform/graphics/qt/GraphicsContextQt.cpp:
        (WebCore::GraphicsContext::platformInit):
        (WebCore::GraphicsContext::platformDestroy):
        (WebCore::GraphicsContext::fillPath):
        (WebCore::GraphicsContext::strokePath):
        (WebCore::GraphicsContext::fillRect):
        (WebCore::GraphicsContext::setPlatformShadow):
        * platform/graphics/skia/GraphicsContextSkia.cpp:
        (WebCore::GraphicsContext::platformInit):
        (WebCore::GraphicsContext::platformDestroy):
        (WebCore::GraphicsContext::fillPath):
        (WebCore::GraphicsContext::setPlatformShadow):
        * platform/graphics/win/GraphicsContextCGWin.cpp:
        (WebCore::GraphicsContext::platformInit):
        * platform/graphics/win/GraphicsContextCairoWin.cpp:
        (WebCore::GraphicsContext::platformInit):
        * platform/graphics/wince/GraphicsContextWinCE.cpp:
        (WebCore::GraphicsContext::platformInit):
        (WebCore::GraphicsContext::platformDestroy):
        (WebCore::GraphicsContext::fillPath):
        (WebCore::GraphicsContext::fillRect):
        * platform/graphics/wx/GraphicsContextWx.cpp:
        (WebCore::GraphicsContext::platformInit):
        (WebCore::GraphicsContext::platformDestroy):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@73492 268f45cc-cd09-0410-ab3c-d52691b4dbfc