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Fixes GLScaler::SupportsPreciseColorManagement() by using GL extension
strings to detect the required GLES2 extensions. Also, use of half-
floats in textures is governed by the "type" argument to glTexImage2d(),
and not the "internal format" argument.

Bug: 870036
Change-Id: I67e90cbadeb0b185025bce01c56b0f9e89e70a71
Reviewed-on: https://chromium-review.googlesource.com/c/1298643Reviewed-by: Xiangjun Zhang <xjz@chromium.org>
Commit-Queue: Yuri Wiitala <miu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#603236}