Added test expectations for context_lost and suppressed flaky failure.

content/test/gpu/gpu_tests/context_lost_expectations.py

 # Copyright (c) 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 from telemetry.page import test_expectations
 
 # Valid expectation conditions are:
 #
 # Operating systems:
 #     win, xp, vista, win7, mac, leopard, snowleopard, lion, mountainlion,
 #     linux, chromeos, android
 #
 # GPU vendors:
 #     amd, arm, broadcom, hisilicon, intel, imagination, nvidia, qualcomm,
 #     vivante
 #
 # Specific GPUs can be listed as a tuple with vendor name and device ID.
 # 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)