https://bugs.webkit.org/show_bug.cgi?id=96140

Reviewed by Sam Weinig.

Temporarily turn on built-in function emulation for Intel GPUs
on OS X. This is a work-around for a driver bug, and
will be removed once the driver is updated:
https://bugs.webkit.org/show_bug.cgi?id=97503

This can be tested using the Khronos WebGL conformance
suite, in particular:

conformance/glsl/functions/glsl-function-dot.html
conformance/glsl/functions/glsl-function-length.html
conformance/glsl/functions/glsl-function-normalize.html
conformance/glsl/functions/glsl-function-reflect.html

Note that the faceforward built-in will still cause
problems on Intel GPUs, but this would require an unnecessary
change in the ANGLE project (remember, we're going to
remove this code once the driver is fixed).

* platform/graphics/opengl/Extensions3DOpenGLCommon.cpp:
(WebCore::Extensions3DOpenGLCommon::getTranslatedShaderSourceANGLE):
    Temporarily add "Intel" to the list of GPUs we do translation
    for in the shader compiler.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@129439 268f45cc-cd09-0410-ab3c-d52691b4dbfc