Bug 1097413 - Symbolic constants kGLESVersion2 and kGLESVersion3. r=jgilbert

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extra : rebase_source : 4d82f144bf9b713b50d995cf4db9340098b8f346
extra : source : 2204f9511fc39f27da83f32dfb9596558e67f83a
Bug 1048747 - [WebGL2] Query active uniform blocks. r=jgilbert

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extra : rebase_source : a84e0bdb81451bdb9c150481855e6e1059f701c4
extra : source : 5154511552bc4bead080a17390bd28488219d65e