Reviewed by Nikolas Zimmermann.

        GraphicsContext: Don't do full save/restore when painting with low quality scaling
        https://bugs.webkit.org/show_bug.cgi?id=48738

        Stash the imageInterpolationQuality() in a local and reset it after painting.

        * platform/graphics/GraphicsContext.cpp:
        (WebCore::GraphicsContext::drawImage):
        (WebCore::GraphicsContext::drawTiledImage):
        (WebCore::GraphicsContext::drawImageBuffer):
        * platform/graphics/haiku/GraphicsContextHaiku.cpp:
        (WebCore::GraphicsContext::imageInterpolationQuality):
        * platform/graphics/skia/GraphicsContextSkia.cpp:
        (WebCore::GraphicsContext::imageInterpolationQuality):
        * platform/graphics/wince/GraphicsContextWinCE.cpp:
        (WebCore::GraphicsContext::imageInterpolationQuality):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@71337 268f45cc-cd09-0410-ab3c-d52691b4dbfc