Add support for backgrounding processes on the Mac

content/test/gpu/gpu_tests/context_lost.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.
 import os
 import time
 
 import context_lost_expectations
 
 from telemetry import benchmark as benchmark_module
 from telemetry.core import exceptions
 from telemetry.core import util
 from telemetry.page import page
 from telemetry.page import page_set
 from telemetry.page import page_test
 
 data_path = os.path.join(
     util.GetChromiumSrcDir(), 'content', 'test', 'data', 'gpu')
 
-wait_timeout = 20  # seconds
+wait_timeout = 27  # seconds

[Ken Russell (switch to Gerrit), 2015/05/15 23:55:55]

If the browser windows that Telemetry opens aren't made the key window, it
sounds to me like all of the GPU tests will run more slowly. I also wonder
whether other test suites that open windows may be affected. Could you please:

 - Watch this test suite and increase the timeout further (up to 60 seconds,
say) if the test becomes flaky
 - File a follow-on bug to investigate why the newly opened window isn't being
made key

Thanks.

 
 harness_script = r"""
   var domAutomationController = {};
 
   domAutomationController._loaded = false;
   domAutomationController._succeeded = false;
   domAutomationController._finished = false;
 
   domAutomationController.setAutomationId = function(id) {}
 
@@ skipping 308 matching lines @@
       user_agent_type='desktop',
       serving_dirs=set(['']))
     ps.AddUserStory(GPUProcessCrashesExactlyOnce(ps, ps.base_dir))
     ps.AddUserStory(WebGLContextLostFromGPUProcessExitPage(ps, ps.base_dir))
     ps.AddUserStory(
         WebGLContextLostFromLoseContextExtensionPage(ps, ps.base_dir))
     ps.AddUserStory(WebGLContextLostFromQuantityPage(ps, ps.base_dir))
     ps.AddUserStory(WebGLContextLostFromSelectElementPage(ps, ps.base_dir))
     ps.AddUserStory(WebGLContextLostInHiddenTabPage(ps, ps.base_dir))
     return ps