[Activity Log] Enable end to end tests on windows.

chrome/test/data/extensions/api_test/activity_log_private/README

 This directory contains tests for chrome extension activity logging.
 
 The tests use two chrome extensions:
   -test  : sends messages to the friend extension and listens for activity
            logged by the friend extension. Checks the activity has been logged
            correctly.
   -friend: recieves messages from the extension and runs a function based on
            the contents of the message.
 
 
@@ skipping 36 matching lines @@
                                         'my_function_call_id',
                                         function response() { });
           },
           expected_activity: ['api.call1', 'api.call2', 'api.call3']
         });
 
         where 'my_function_call_id' is the key you added to the fn_map in
         reply.js.
 
 
+Running a testcase in Incognito mode:
+  
+  To check logging when run in incognito mode, add the following to the
+  testcase:
+      
+      is_incognito: true
+
+  This will automatically cause all new tabs to be opened in incognito mode and
+  check the url information has been correctly cleaned.  
+
+
+Configuring a testcase for a particular OS:  
+  
+  If you need to disable a test for a particular OS then you can do this by
+  adding the disabled field to the test case. For example:
+       
+       disabled:  {win: true, mac: true}
+
+  If you need to configure different expected activity for a particular OS, you
+  can override the logging. E.g.:
+
+       expected_activity_win: ['api.call1', 'api.call2', 'api.call3']
+       expected_activity_mac: ['api.call1', 'api.call2', 'api.call3']
+       
+  See the chrome.runtime.getPlatformInfo documentation for details of which OS
+  names to use.
+
+
 Running the tests:
 
   > out/Debug/browser_tests --gtest_filter=ActivityLogApiTest.TriggerEvent
 
 
 Running in manual mode:
 
   (1) Start chrome with out/Debug/chrome
   (2) Navigate to chrome://extensions
   (3) Install the friend and test extensions from your chrome src folder
   (4) Click on the "options" link under the friend extension
   (5) You should see the options page the buttons to run the functions manually