Suppress flaky TraceTest_Video_Context_Loss_VP9 on Nexus 5X

TBR=kbr

Bug: 965730
Change-Id: Ic6acadfb8cadcd423578ccde479a5e97418eafa1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1622794Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Yuly Novikov <ynovikov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#662014}

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

 # tags: [ android chromeos linux mac win win10 win7 ]
 # tags: [ debug ]
-# tags: [ intel nvidia ]
+# tags: [ intel nvidia qualcomm-adreno-(tm)-418 ]
 
  # TODO(kbr): flakily timing out on this configuration.
 crbug.com/648369 [ linux debug intel ] TraceTest_* [ RetryOnFailure ]
@@ -33,3 +33,4 @@ crbug.com/937545 [ win10 nvidia ] VideoPathTraceTest_DirectComposition_ComplexOv
 
 # Flaky for unknown reason.
 crbug.com/960007 [ win10 nvidia ] OverlayModeTraceTest_DirectComposition_Nonroot [ RetryOnFailure ]
+crbug.com/965730 [ android qualcomm-adreno-(tm)-418 ] TraceTest_Video_Context_Loss_VP9 [ RetryOnFailure ]