Source/WebKit/WebProcess/WebPage/DrawingArea.messages.in

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messages -> DrawingArea NotRefCounted {
    UpdateBackingStoreState(uint64_t backingStoreStateID, bool respondImmediately, float deviceScaleFactor, WebCore::IntSize size, WebCore::IntSize scrollOffset)
    DidUpdate()

#if PLATFORM(COCOA)
    // Used by TiledCoreAnimationDrawingArea.
    UpdateGeometry(WebCore::IntSize viewSize, bool flushSynchronously, MachSendRight fencePort)
    SetDeviceScaleFactor(float deviceScaleFactor)
    SetColorSpace(struct WebKit::ColorSpaceData colorSpace)
    SetViewExposedRect(Optional<WebCore::FloatRect> viewExposedRect)

    AdjustTransientZoom(double scale, WebCore::FloatPoint origin)
    CommitTransientZoom(double scale, WebCore::FloatPoint origin)
    
    AcceleratedAnimationDidStart(uint64_t layerID, String key, MonotonicTime startTime)
    AcceleratedAnimationDidEnd(uint64_t layerID, String key)
    
    AddTransactionCallbackID(WebKit::CallbackID callbackID)
#endif
}