bug 903481 - step 1 - Move WebGL buffers function into GLContextBuffers.cpp - r=jgilbert
bug 903481 - step 2 - [WebGL 2.0] transform feedback: add symbols in GLContext - r=jgilbert
bug 903481_- step 3 - [WebGL 2.0] implement TRANSFORM_FEEDBACK_BUFFER - r=jgilbert
Bug 907085 - Don't use GetIonContext->cx during GC (r=jandem)

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extra : rebase_source : 0c442c82e71435dd8712a67cc7f01f00010f1e41