Patch providing CEF3 GetSource(), GetText() and general StringVisitor support

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The attached patch adds support to CEF3 cefpython for the GetSource() and 
GetText() methods. These methods are asynchronous in CEF3 unlike in CEF1.

StringVisitor C++/Python classes are added and used to call into a Visit() 
method to cef to be asynchronously called when it has the page source or text 
ready to be returned.

This is used to pass the returned source or text into a user's python program.

wxpthon.py and wxpython.html have been modified to demonstrate both methods 
with javascript calls to dump page source or page text to console.

Original issue reported on code.google.com by gregfarr...@gmail.com on 28 Nov 2013 at 4:30

Attachments:

• StringVisitor.diff