Added test expectations for context_lost and suppressed flaky failure.

content/test/gpu/gpu_tests/context_lost_expectations.py

Index: content/test/gpu/gpu_tests/context_lost_expectations.py
diff --git a/content/test/gpu/gpu_tests/maps_expectations.py b/content/test/gpu/gpu_tests/context_lost_expectations.py
similarity index 77%
copy from content/test/gpu/gpu_tests/maps_expectations.py
copy to content/test/gpu/gpu_tests/context_lost_expectations.py
index a3ad0fe5d7a8df7df2fd401ff67d13301db6d8cb..b033728e5cb922a8aaafd1dc385c76258637a01c 100644
--- a/content/test/gpu/gpu_tests/maps_expectations.py
+++ b/content/test/gpu/gpu_tests/context_lost_expectations.py
@@ -18,10 +18,11 @@ from telemetry.page import test_expectations
 # Examples: ('nvidia', 0x1234), ('arm', 'Mali-T604')
 # Device IDs must be paired with a GPU vendor.
 
-class MapsExpectations(test_expectations.TestExpectations):
+class ContextLostExpectations(test_expectations.TestExpectations):
   def SetExpectations(self):
     # Sample Usage:
-    # self.Fail('Maps.maps_001',
+    # self.Fail('ContextLost.WebGLContextLostFromGPUProcessExit',
     #     ['mac', 'amd', ('nvidia', 0x1234)], bug=123)
 
-    pass
+    self.Fail('GpuCrash.GPUProcessCrashesExactlyOnce',
+              ['win'], bug=392891)