Bug 1048720 - WebGL2 - GL symbols for Samplers.; r=jgilbert

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extra : rebase_source : e166bb27c051843bc469389fddd8fce8ef425ad3
extra : source : 2203b912f17e2f501f9bf65343dfadb05256dfd8
Bug 1048745 - WebGL2 - GL symbols for uniformui & non-square uniform matrix.; r=jgilbert

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extra : rebase_source : bd47b6bbde06ba7f8a945aa55f751d8a3c074946
extra : source : 5b135f5f9492b2606c593ad0c800488f6a51274c
Bug 1048745 - WebGL2 - GL symbols for VertexAttribI.; r=jgilbert

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extra : rebase_source : 57ceb97a1f21c85427c8108ea7ff41f93fe24789
extra : source : 0d1c61620e601c851f61cd062e42204c2e50e3e0
Bug 1048745 - WebGL2 - GL symbols for gpu_shader_4.; r=jgilbert

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extra : rebase_source : 9da56a67fc59ef27a8ff28e960bfc1175a6fc936
extra : source : 0c1b303c73fa1f7dad836235d4916ae6b618bfe2
Bug 1048724 - WebGL2 - GL symbols for Transform Feedback.; r=jgilbert

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extra : rebase_source : f47b2a8203b0dc23dd871987c2b2f7dae28b2723
extra : source : a0ecb0468b8a2998b676da63678938d9f9d58f52
Bug 1048741 - WebGL2 - GL symbols for texture storage.; r=jgilbert

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extra : rebase_source : 4465ba102179f3ae338f19632d77547686df0220
Bug 1048741 - WebGL2 - GL symbols for 3D textures.; r=jgilbert

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extra : rebase_source : f1ab1982187f5c611a0f13fbcdb38414b2fe8942