Suppress ContextLost.WebGLContextLostFromGPUProcessExit flakes on Win7.

content/test/gpu/gpu_tests/context_lost_expectations.py

 # Copyright 2014 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 gpu_tests.gpu_test_expectations import GpuTestExpectations
 
 # See the GpuTestExpectations class for documentation.
 
 class ContextLostExpectations(GpuTestExpectations):
   def SetExpectations(self):
     # Sample Usage:
     # self.Fail('ContextLost.WebGLContextLostFromGPUProcessExit',
     #     ['mac', 'amd', ('nvidia', 0x1234)], bug=123)
 
     # AMD Radeon 6450
     self.Fail('ContextLost.WebGLContextLostFromGPUProcessExit',
         ['linux', ('amd', 0x6779)], bug=479975)
 
+    # Win7 bots
+    self.Flaky('ContextLost.WebGLContextLostFromGPUProcessExit',
+               ['win7'], bug=603329)
+
     # Win8 Release and Debug NVIDIA bots.
     self.Skip('ContextLost.WebGLContextLostFromSelectElement',
               ['win8', 'nvidia'], bug=524808)
 
     # Flaky on Mac 10.7 and 10.8 resulting in crashes during browser
     # startup, so skip this test in those configurations.
     self.Skip('ContextLost.WebGLContextLostFromSelectElement',
               ['mountainlion', 'debug'], bug=497411)
     self.Skip('ContextLost.WebGLContextLostFromSelectElement',
               ['lion', 'debug'], bug=498149)