Suppress flaky pixel_skia_gold_test on NVIDIA Android

Pixel_Video_Context_Loss_VP9 (flaking on Nexus 9)
Pixel_WebGL2_BlitFramebuffer_Result_Displayed (flaking on NVIDIA Shield
TV)

Bug: 1019462
Change-Id: I2d211502c0133dc45d70be605e9a34202ab29feb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1900576Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Commit-Queue: kylechar <kylechar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#713050}

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

@@ -254,9 +254,11 @@ crbug.com/983600 [ mojave amd-0x6821 ] Pixel_CSSFilterEffects_NoOverlays [ Retry
 # Producing incorrect image on Win10 Intel HD 630 w/ 26.20.100.6912 drivers.
 crbug.com/997313 [ win intel-0x5912 ] Pixel_WebGL_PremultipliedAlpha_False [ Failure ]
 
-# Flakes on Nexus 9
+# Flakes on Nexus 9 or NVIDIA Shield TV
 crbug.com/1019462 [ android nvidia no-skia-renderer ] Pixel_Video_MP4_FourColors_Aspect_4x3 [ RetryOnFailure ]
 crbug.com/1019462 [ android nvidia no-skia-renderer ] Pixel_Video_MP4_FourColors_Rot_180 [ RetryOnFailure ]
 crbug.com/1019462 [ android nvidia no-skia-renderer ] Pixel_Video_MP4_FourColors_Rot_270 [ RetryOnFailure ]
 crbug.com/1019462 [ android nvidia no-skia-renderer ] Pixel_Video_MP4_FourColors_Rot_90 [ RetryOnFailure ]
 crbug.com/1019462 [ android nvidia no-skia-renderer ] Pixel_Video_MP4_Rounded_Corner [ RetryOnFailure ]
+crbug.com/1019462 [ android nvidia no-skia-renderer ] Pixel_Video_Context_Loss_VP9 [ RetryOnFailure ]
+crbug.com/1019462 [ android nvidia no-skia-renderer ] Pixel_WebGL2_BlitFramebuffer_Result_Displayed [ RetryOnFailure ]