Mark couple context_lost_tests fail

ContextLost_WebGLBlockedAfterJSNavigation
ContextLost_WebGLUnblockedAfterUserInitiatedReload
on Android Nvidia (Nexus 9 and Shield TV)

BUG=832886
TBR=kbr@chromium.org

Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Change-Id: I0b945fe5c02824ae92524d7592d899a9f1bac504
Reviewed-on: https://chromium-review.googlesource.com/1012982
Commit-Queue: Yuly Novikov <ynovikov@chromium.org>
Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550772}

content/test/gpu/gpu_tests/context_lost_expectations.py

@@ -53,3 +53,10 @@ class ContextLostExpectations(GpuTestExpectations):
               ['android', ('qualcomm', 'Adreno (TM) 420')], bug=611906)
     self.Fail('ContextLost_WebGLContextLostFromQuantity',
               ['android', ('qualcomm', 'Adreno (TM) 420')], bug=611906)
+
+    # Nexus 9 and Nvidia Shield TV
+    self.Fail('ContextLost_WebGLBlockedAfterJSNavigation',
+              ['android', 'nvidia'], bug=832886)
+    self.Fail('ContextLost_WebGLUnblockedAfterUserInitiatedReload',
+              ['android', 'nvidia'], bug=832886)
+