[Fuchsia] Skip flaky pixel test on Fuchsia.

Bug: 1123095
Change-Id: I1e875997179c73c0504690e3efe1809b11e9d864
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2382295
Auto-Submit: Chong Gu <chonggu@google.com>
Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#802768}

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

@@ -141,6 +141,9 @@ crbug.com/648369 [ linux debug intel ] * [ RetryOnFailure ]
 # further.
 crbug.com/660461 [ mac ] Pixel_ScissorTestWithPreserveDrawingBuffer [ RetryOnFailure ]
 
+# Flaky on Fuchsia
+crbug.com/1123095 [ Fuchsia ] Pixel_PrecisionRoundedCorner [ Skip ]
+
 # Failing on Nexus 5; haven't investigated why yet.
 crbug.com/773293 [ android no-use-gl qualcomm-adreno-(tm)-330 ] Pixel_WebGL2_BlitFramebuffer_Result_Displayed [ Skip ]
 crbug.com/773293 [ android qualcomm-adreno-(tm)-330 ] Pixel_WebGL2_ClearBufferfv_Result_Displayed [ Skip ]