Retry several GPU pixel tests on failure

Sets several GPU pixel tests on Mac and Win7 to retry on failure due to
their configurations flakily producing valid images that haven't been
seen in a while. This hits a known issue with Skia Gold where images
that haven't been seen in a while aren't included in the provided
baselines.

Bug: 983212
Change-Id: I12fedb9b68ed811108dfd3c88821eb7838d76a56
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1698661Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#676624}

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

-# tags: [ android chromeos highsierra linux mac mojave win ]
+# tags: [ android chromeos highsierra linux mac mojave win win7 ]
 # tags: [ android-chromium android-webview-instrumentation debug ]
 # tags: [ skia-renderer no-skia-renderer ]
 # tags: [ use-vulkan no-use-vulkan ]
 # tags: [ amd amd-0x6613 amd-0x679e amd-0x6821 intel intel-0xa2e intel-0x5912
-#         nvidia nvidia-0xfe9 qualcomm-adreno-(tm)-330 qualcomm-adreno-(tm)-418
-#         qualcomm-adreno-(tm)-420 qualcomm-adreno-(tm)-430
-#         qualcomm-adreno-(tm)-540
+#         nvidia nvidia-0xfe9 nvidia-0x1cb3 qualcomm-adreno-(tm)-330
+#         qualcomm-adreno-(tm)-418 qualcomm-adreno-(tm)-420
+#         qualcomm-adreno-(tm)-430 qualcomm-adreno-(tm)-540
 # ]
 # results: [ Failure RetryOnFailure Skip ]
 
@@ -219,3 +219,14 @@ crbug.com/969864 [ android skia-renderer use-vulkan ] Pixel_WebGLTransparentGree
 
 # Produces blank images on Intel HD 630 w/ Mesa 19.0.2
 crbug.com/976861 [ linux intel-0x5912 ] Pixel_OffscreenCanvasTransferToImageBitmap [ Skip ]
+
+# For whatever reason, these configurations are more prone to running into the
+# issue of producing valid images that haven't been seen for a long time, which
+# hits a known issue with Gold.
+crbug.com/983212 [ mac amd-0x679e ] Pixel_WebGLGreenTriangle_NonChromiumImage_AA_NoAlpha [ RetryOnFailure ]
+crbug.com/983212 [ mac amd-0x679e ] Pixel_WebGLGreenTriangle_NonChromiumImage_NoAA_Alpha [ RetryOnFailure ]
+crbug.com/983212 [ mac amd-0x679e ] Pixel_WebGLGreenTriangle_NonChromiumImage_NoAA_NoAlpha [ RetryOnFailure ]
+crbug.com/983212 [ mac amd-0x679e ] Pixel_WebGLGreenTriangle_NonChromiumImage_AA_Alpha [ RetryOnFailure ]
+crbug.com/983212 [ mac amd-0x679e ] Pixel_CSSFilterEffects_NoOverlays [ RetryOnFailure ]
+crbug.com/983212 [ win7 amd-0x6613 ] Pixel_CSS3DBlueBox [ RetryOnFailure ]
+crbug.com/983212 [ win7 nvidia-0x1cb3 ] Pixel_CSS3DBlueBox [ RetryOnFailure ]