gpu: Mark maps pixel test as flaky on Win10 NVIDIA

TBR=zmo@chromium.org

Bug: 1053892
Change-Id: Id0fd2c696d1982101b849490bc899e3393dd84dd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2063014Reviewed-by: Sergey Poromov <poromov@chromium.org>
Commit-Queue: Sergey Poromov <poromov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#742580}

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

-# tags: [ android ]
+# tags: [ android win10 ]
 # tags: [ android-nexus-5x android-nexus-5 ]
 # tags: [ skia-renderer no-skia-renderer ]
+# tags: [ nvidia ]
 # results: [ Failure RetryOnFailure Skip ]
 
 crbug.com/1006045 [ android android-nexus-5x skia-renderer ] Maps_maps [ Failure ]
 crbug.com/1009137 [ android android-nexus-5 no-skia-renderer ] Maps_maps [ RetryOnFailure ]
+crbug.com/1053892 [ win10 nvidia ] Maps_maps [ Failure ]