Sync to I29fc45cc5bd693eb796d4ea256c0b23afe39b192

Sync to I29fc45cc5bd693eb796d4ea256c0b23afe39b192

    Add new event path & change pixmap 24 to 32.

    Accessibility event paths are added.

    Fix the bug of size changed event handler.
    Because of invalid fbfile, the size of a box is resetted.
    I used instance id instead of fb id,.
    So the box buffer info indicates invalid uri
    This patch will fix it.

    master will send a new fbid when it sending the size,changed event.
    Then the viewer will get it and update the fbinfo using received fbid.

    Remove unnecessary parameter checking code.
    Maybe accidently remained.
    Add hold scroll event path.
    Some box wants to hold the viewer's scroller when they handling their events.

Change-Id: If1832b1c841cb5c3e793103f3d728ed36c116bdc