Webkit: javascript alternative to <select> form elements.

Change-Id: I2d1b31bb54d2b6f9f57c7603f39ba0cca7dcd328
Code review, refactoring of the WebkitPixelStreamer and associted tests.

Change-Id: I6973bb337039e27a6172ee05fa83fcab333643e9
Merge pull request #53 from rdumusc/webkitselect

Webkit: javascript alternative to select form elements.