[webkit-qt] Enabling WebGL by default

[noam.rosenthal at nokia.com]

Hi folks
There was a lot of work done by Jarkko, Andrew and others to get WebGL up and running on Qt.
Also, WebGL is getting more and more traction in the industry.
I believe that it's time we let it build by default, while keeping it off in the settings by default.
This would allow more people to test WebGL more easily, and would also protect us from Apple/Google build breakages since the bots are going to build it. Now that the bots can use OpenGL, adding tests would be a possible next step.

Any objections?
No'am