#20 GeneratedImage::drawPattern assert crashes python

[Krzysztof Marciniak]

Summary:
Some web sites crash python, for example google maps.

Reproduction:
1. Run simple.py from python binding example
2. go to maps.google.com

Application will crash, sometimes with error:
ASSERTION FAILED: imageBuffer.get()
(..\platform\graphics\GeneratedImage.cpp:55 WebCore::GeneratedImage::drawPattern
)

This happens in any wxwebkit application which tries to open any webpage using google maps. Sometimes one tile on map will be shown just before crash.