Suppress Pixel_WebGLReadPixelsTabSwitch on Nexus 5X

Renderer process is intermittently hanging; minidumps do not show why.

Bug: 1065514
Change-Id: I585dc0354be9daa734ac9e9c47ce59896ee59e77
Tbr: bsheedy@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2365756Reviewed-by: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
Commit-Queue: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799990}

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

@@ -183,6 +183,7 @@ crbug.com/1029389 [ android qualcomm-adreno-(tm)-330 ] Pixel_PrecisionRoundedCor
 # Flakes on Nexus 5X.
 crbug.com/883500 [ android-chromium no-use-gl no-use-vulkan qualcomm-adreno-(tm)-418 ] Pixel_BackgroundImage [ RetryOnFailure ]
 crbug.com/1068620 [ android android-chromium no-use-gl no-use-vulkan qualcomm-adreno-(tm)-418 ] Pixel_OffscreenCanvasWebGLPaintAfterResize [ RetryOnFailure ]
+crbug.com/1065514 [ android android-chromium qualcomm-adreno-(tm)-418 ] Pixel_WebGLReadPixelsTabSwitch [ RetryOnFailure ]
 
 # We do not have software H.264 decoding on Android, so it can't survive a
 # context loss which results in hardware decoder loss.