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Gpu FeatureInfo::FeatureFlags.chromium_image_xr30 doesn't work
on Swiftshader because it doesn't support GL_BGRA(_EXT) for
glImage2D(), making our texture uploads fail.  This failure is
legit because GLES 3.0 supports only GL_RGBA data format.

So this CL disables chromium_image_xr30 until the swiftshader
bug is addressed (adding a TODO), and also corrects the OpenGL
version where GL_EXT_texture_type_2_10_10_10_REV was inlined,
which is 3.3 and not 4.2 as I wrote erroneously before, oops!
(see http://go/gl3.3)

Bug: 808172, swiftshader:95
Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: I0c6952b14ff53fb504bf292c51a8bc2ffe612918
Reviewed-on: https://chromium-review.googlesource.com/899462Reviewed-by: Antoine Labour <piman@chromium.org>
Commit-Queue: Miguel Casas <mcasas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#534216}