Suppress context-size-change.html test for mac pro amd

Bug: 992231
Change-Id: I916838267b6a5112d74ede2f5a36286a4891db1e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1745620
Commit-Queue: Shrek Shao <shrekshao@google.com>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#685493}

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

 # tags: [ android chromeos linux mac win win10 win7 ]
 # tags: [ android-chromium android-webview-instrumentation ]
 # tags: [ debug release ]
-# tags: [ amd amd-0x6613 amd-0x699f intel intel-0xa011 intel-0xa2e nvidia
+# tags: [ amd amd-0x6613 amd-0x699f amd-0x679e intel intel-0xa011 intel-0xa2e nvidia
 #         nvidia-0x1cb3 nvidia-0x2184 nvidia-0xfe9 qualcomm
 #         qualcomm-adreno-(tm)-330 qualcomm-adreno-(tm)-418
 #         qualcomm-adreno-(tm)-420 qualcomm-adreno-(tm)-430 ]
@@ -386,6 +386,9 @@ crbug.com/989194 [ mac passthrough ] conformance/textures/misc/texture-video-tra
 # Mac / Passthrough command decoder / AMD
 crbug.com/angleproject/3767 [ mac passthrough amd ] conformance/rendering/rendering-stencil-large-viewport.html [ Failure ]
 
+# Mac Pro (AMD) / Passthrough command decoder
+crbug.com/992231 [ mac passthrough amd-0x679e ] conformance/context/context-size-change.html [ Failure ]
+
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 # Linux failures   #
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