Mac test failures

[pjcozzi]

@hpinkos can you look at these on my or @shunter's Mac? There was one other failure that I already fixed in the macfixes branch.

With the latest version of Chrome:

Scene/GeometryRendering Extruded ExtentGeometry renders north wall. (show summary)
Expected { 0 : 0, 1 : 0, 2 : 0, 3 : 0, length : 4, byteLength : 4, byteOffset : 0, buffer : { byteLength : 4 } } not to equal [ 0, 0, 0, 0 ].
Error: Expected { 0 : 0, 1 : 0, 2 : 0, 3 : 0, length : 4, byteLength : 4, byteOffset : 0, buffer : { byteLength : 4 } } not to equal [ 0, 0, 0, 0 ].
    at new jasmine.ExpectationResult (http://localhost:8080/ThirdParty/jasmine-1.3.1/jasmine.js:114:32)
    at null.toEqual (http://localhost:8080/ThirdParty/jasmine-1.3.1/jasmine.js:1243:29)
    at render3D (http://localhost:8080/Specs/Scene/GeometryRenderingSpec.js:145:42)
    at null.<anonymous> (http://localhost:8080/Specs/Scene/GeometryRenderingSpec.js:733:13)
    at jasmine.Block.execute (http://localhost:8080/ThirdParty/jasmine-1.3.1/jasmine.js:1072:17)
    at jasmine.Queue.next_ (http://localhost:8080/ThirdParty/jasmine-1.3.1/jasmine.js:2104:31)
    at jasmine.Queue.start (http://localhost:8080/ThirdParty/jasmine-1.3.1/jasmine.js:2057:8)
    at jasmine.Spec.execute (http://localhost:8080/ThirdParty/jasmine-1.3.1/jasmine.js:2386:14)
    at jasmine.Queue.next_ (http://localhost:8080/ThirdParty/jasmine-1.3.1/jasmine.js:2104:31)
    at jasmine.Queue.start (http://localhost:8080/ThirdParty/jasmine-1.3.1/jasmine.js:2057:8)
Scene/GeometryRendering Extruded PolygonGeometry renders wall 1. (show summary)
Expected { 0 : 0, 1 : 0, 2 : 0, 3 : 0, length : 4, byteLength : 4, byteOffset : 0, buffer : { byteLength : 4 } } not to equal [ 0, 0, 0, 0 ].
Error: Expected { 0 : 0, 1 : 0, 2 : 0, 3 : 0, length : 4, byteLength : 4, byteOffset : 0, buffer : { byteLength : 4 } } not to equal [ 0, 0, 0, 0 ].
    at new jasmine.ExpectationResult (http://localhost:8080/ThirdParty/jasmine-1.3.1/jasmine.js:114:32)
    at null.toEqual (http://localhost:8080/ThirdParty/jasmine-1.3.1/jasmine.js:1243:29)
    at render3D (http://localhost:8080/Specs/Scene/GeometryRenderingSpec.js:145:42)
    at null.<anonymous> (http://localhost:8080/Specs/Scene/GeometryRenderingSpec.js:932:13)
    at jasmine.Block.execute (http://localhost:8080/ThirdParty/jasmine-1.3.1/jasmine.js:1072:17)
    at jasmine.Queue.next_ (http://localhost:8080/ThirdParty/jasmine-1.3.1/jasmine.js:2104:31)
    at jasmine.Queue.start (http://localhost:8080/ThirdParty/jasmine-1.3.1/jasmine.js:2057:8)
    at jasmine.Spec.execute (http://localhost:8080/ThirdParty/jasmine-1.3.1/jasmine.js:2386:14)
    at jasmine.Queue.next_ (http://localhost:8080/ThirdParty/jasmine-1.3.1/jasmine.js:2104:31)
    at http://localhost:8080/ThirdParty/jasmine-1.3.1/jasmine.js:2094:18
Scene/GeometryRendering Extruded PolygonGeometry renders wall 2. (show summary)
Expected { 0 : 0, 1 : 0, 2 : 0, 3 : 0, length : 4, byteLength : 4, byteOffset : 0, buffer : { byteLength : 4 } } not to equal [ 0, 0, 0, 0 ].
Error: Expected { 0 : 0, 1 : 0, 2 : 0, 3 : 0, length : 4, byteLength : 4, byteOffset : 0, buffer : { byteLength : 4 } } not to equal [ 0, 0, 0, 0 ].
    at new jasmine.ExpectationResult (http://localhost:8080/ThirdParty/jasmine-1.3.1/jasmine.js:114:32)
    at null.toEqual (http://localhost:8080/ThirdParty/jasmine-1.3.1/jasmine.js:1243:29)
    at render3D (http://localhost:8080/Specs/Scene/GeometryRenderingSpec.js:145:42)
    at null.<anonymous> (http://localhost:8080/Specs/Scene/GeometryRenderingSpec.js:943:13)
    at jasmine.Block.execute (http://localhost:8080/ThirdParty/jasmine-1.3.1/jasmine.js:1072:17)
    at jasmine.Queue.next_ (http://localhost:8080/ThirdParty/jasmine-1.3.1/jasmine.js:2104:31)
    at jasmine.Queue.start (http://localhost:8080/ThirdParty/jasmine-1.3.1/jasmine.js:2057:8)
    at jasmine.Spec.execute (http://localhost:8080/ThirdParty/jasmine-1.3.1/jasmine.js:2386:14)
    at jasmine.Queue.next_ (http://localhost:8080/ThirdParty/jasmine-1.3.1/jasmine.js:2104:31)
    at http://localhost:8080/ThirdParty/jasmine-1.3.1/jasmine.js:2094:18