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This CL moves JpegDecodeAcceleratorTestEnvironment upwards so that
the test-specific classes and the static classes are grouped together.

No new code whatsoever.

Bug: 877694
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Change-Id: Ida2c6024526baf62933f058b3539bbb51306406e
Reviewed-on: https://chromium-review.googlesource.com/1204772Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Commit-Queue: Miguel Casas <mcasas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589194}