[Fuchsia] Add filter for Fuchsia astro board.

Bug: 1080853
Change-Id: I8b19c2f5380eecc06800671c157621e3bfed77b3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2531176
Auto-Submit: Chong Gu <chonggu@google.com>
Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Commit-Queue: Chong Gu <chonggu@google.com>
Cr-Commit-Position: refs/heads/master@{#826194}

content/test/gpu/gpu_tests/test_expectations/webgl_conformance_expectations.txt

@@ -169,6 +169,7 @@ crbug.com/1145951 [ fuchsia fuchsia-board-astro ] conformance/rendering/preserve
 # Specific build issue
 crbug.com/1146483 [ fuchsia fuchsia-board-astro ] conformance/textures/misc/tex-video-using-tex-unit-non-zero.html [ Skip ]
 crbug.com/1146483 [ fuchsia fuchsia-board-astro ] conformance/textures/misc/texture-upload-size.html [ Skip ]
+crbug.com/1146483 [ fuchsia fuchsia-board-astro ] conformance/textures/misc/texture-video-transparent.html [ Skip ]
 crbug.com/1146483 [ fuchsia fuchsia-board-astro ] conformance/textures/image_bitmap_from_video/tex-2d-alpha-alpha-unsigned_byte.html [ Skip ]
 crbug.com/1146483 [ fuchsia fuchsia-board-astro ] conformance/textures/video/tex-2d-alpha-alpha-unsigned_byte.html [ Skip ]