[Pidgin] #15812: scroll down webview after a message append

[Pidgin]

#15812: scroll down webview after a message append
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 Reporter:  salinasv  |      Owner:  QuLogic
     Type:  defect    |     Status:  new
Milestone:  3.0.0     |  Component:  pidgin (gtk)
  Version:  2.10.7    |   Keywords:  webkit scroll
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 it looks like nearBottom() is returning false for me when the wevbiew is
 bigger than the window.

 I found that document.body.scrollTop is always 0 for me (I don't know if
 that is something particular to my box) so I found this new way to
 reference the top page offset: window.pageYOffset

 I tested it locally and it works. But I still want a review form someone
 who actually knows javascript and all this web details.

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Ticket URL: <https://developer.pidgin.im/ticket/15812>
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