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This CL extends the copyTextureCHROMIUM implementation to support
RGB10_A2 (see bug for the use case).

It also extends gl_copy_texture_CHROMIUM_unittest.cc appropriately,
and cleans it a tiny bit (const, removal of dead code, style).

For some reason, glCopy(Sub)TextureCHROMIUM() fails on Adreno 4xx,
this CL adds a workaround for it, see crbug.com/925986.

Bug: 922198, 925986
Change-Id: I8e4e95d766e89282cec1fc11e86c2c2fadc807fc
Reviewed-on: https://chromium-review.googlesource.com/c/1418330
Commit-Queue: Miguel Casas <mcasas@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#626896}