Tests general layer tree model functionality
Initial layer tree
<invalid node id> 0x0 (0)
    #document (1)
    #document (1)
    div#subframe1 80x80 (1)
    div#a 200x200 (1)
    div#b1 100x150 (1)
    div#b2 110x140 (1)
    div#c 90x100 (1)
    div#b3 110x140 (1)
    <invalid node id> (1)
Updated layer tree
<invalid node id> 0x0 (0)
    #document (1)
    #document (1)
    div#subframe1 80x80 (1)
    div#a 200x200 (1)
    div#b2 110x140 (1)
    div#c 90x100 (1)
    div#b1 100x150
    div#b4 88x77
    <invalid node id> (1)
Updated layer geometry
<invalid node id> 0x0 (0)
    #document (1)
    #document (1)
    div#subframe1 80x80 (1)
    div#a 200x200 (1)
    div#b2 110x140 (1)
    div#c 90x80 (1)
    div#b1 100x150
    div#b4 88x77
    <invalid node id> (1)