Bug 1048747 - [WebGL2] Implement GetTexParameter for all valid WebGL2 pnames. r=jgilbert

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Bug 1048745 - [WebGL2] Extend UniformInfo with WebGL2/GLES3 types. r=jgilbert

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extra : histedit_source : d40023d4f0c0a511c822969fae15d273561ad30e
Bug 1048741 - [WebGL2] texParameter: TEXTURE_COMPARE_MODE and TEXTURE_COMPARE_FUNC support. r=jgilbert

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