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What’s New in OpenGL ES 3.0 among GL extentions
- Vertex array
- Element index uint
- npot texture
- float texture (1)(2)
- GLSL standard derivatives
- Blend min&max

(1) GLES3 supports float and half float texture but only half float texture is
filterable and doesn't allow them for color attachment.
(2) This CL doesn't enable half_float due to conflicting GL_OES_texture_float

BUG=405484

Review URL: https://codereview.chromium.org/489023002

Cr-Commit-Position: refs/heads/master@{#292849}