Reviewed by David Hyatt.

        https://bugs.webkit.org/show_bug.cgi?id=19663 (Second attempt)
        Account for paint and timer lag when animating images.  Also pretend
        that images whose animations were paused (by becoming invisible)
        continued to animate, by "catching up" to the correct frame when they're
        shown again.

        * platform/graphics/BitmapImage.cpp:
        (WebCore::BitmapImage::BitmapImage):
        (WebCore::BitmapImage::destroyDecodedData):
        (WebCore::BitmapImage::cacheFrame):
        (WebCore::BitmapImage::frameIsCompleteAtIndex):
        (WebCore::BitmapImage::frameDurationAtIndex):
        (WebCore::BitmapImage::frameHasAlphaAtIndex):
        (WebCore::BitmapImage::repetitionCount):
        (WebCore::BitmapImage::shouldAnimate):
        (WebCore::BitmapImage::startAnimation):
        (WebCore::BitmapImage::resetAnimation):
        (WebCore::BitmapImage::advanceAnimation):
        (WebCore::BitmapImage::internalAdvanceAnimation):
        (WebCore::BitmapImage::notifyObserverAndTrimDecodedData):
        * platform/graphics/BitmapImage.h:
        (WebCore::FrameData::FrameData):
        (WebCore::BitmapImage::):
        * platform/graphics/GeneratedImage.h:
        (WebCore::GeneratedImage::destroyDecodedData):
        * platform/graphics/Image.h:
        * platform/graphics/cairo/ImageCairo.cpp:
        (WebCore::FrameData::clear):
        (WebCore::BitmapImage::BitmapImage):
        (WebCore::BitmapImage::draw):
        * platform/graphics/cg/ImageCG.cpp:
        (WebCore::FrameData::clear):
        (WebCore::BitmapImage::BitmapImage):
        (WebCore::BitmapImage::draw):
        * platform/graphics/cg/PDFDocumentImage.h:
        (WebCore::PDFDocumentImage::destroyDecodedData):
        * platform/graphics/qt/ImageQt.cpp:
        (WebCore::FrameData::clear):
        (WebCore::BitmapImage::draw):
        * platform/graphics/wx/ImageWx.cpp:
        (WebCore::FrameData::clear):
        (WebCore::BitmapImage::draw):
        * svg/graphics/SVGImage.h:
        (WebCore::SVGImage::destroyDecodedData):



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@37612 268f45cc-cd09-0410-ab3c-d52691b4dbfc