Introduces a search term extraction mechanism working for arbitrary search providers.

chrome/test/data/policy/policy_test_cases.json

 {
   "-- Template --": {
     "intro": "Top-level entries map a policy name to its test parameters, described below.",
 
     "pref": "The pref that this policy maps to, if any.",
     "test_policy": "A policy dictionary that should trigger the managed banner in the settings UI. Usually just sets the current policy.",
     "settings_pages": ["A list of settings pages where the banner should be visible when this policy is set."],
     "os": ["List of operating systems that support this policy. Valid values:", "win", "linux", "mac", "chromeos"],
     "local_state": "Optionally indicate that |pref| is registed in local state, instead of in the profile PrefService.",
     "official_only": "Optionally set this to true if this policy only works on official builds."
@@ skipping 534 matching lines @@
     "os": ["win", "linux", "mac", "chromeos"]
   },
 
   "DefaultSearchProviderEncodings": {
     "pref": "default_search_provider.encodings",
     "test_policy": { "DefaultSearchProviderSearchURL": "http://www.google.com/?q={searchTerms}", "DefaultSearchProviderEncodings": ["UTF-8"] },
     "settings_pages": [],
     "os": ["win", "linux", "mac", "chromeos"]
   },
 
+  "DefaultSearchProviderAlternateURLs": {
+    "pref": "default_search_provider.alternate_urls",
+    "test_policy": { "DefaultSearchProviderSearchURL": "http://www.google.com/?q={searchTerms}", "DefaultSearchProviderAlternateURLs": ["http://www.google.com/#q={searchTerms}", "http://www.google.com/search#q={searchTerms}"] },
+    "settings_pages": [],
+    "os": ["win", "linux", "mac", "chromeos"]
+  },
+
   "DefaultCookiesSetting": {
     "pref": "profile.managed_default_content_settings.cookies",
     "test_policy": { "DefaultCookiesSetting": 2 },
     "settings_pages": ["chrome://settings-frame/content"],
     "os": ["win", "linux", "mac", "chromeos"]
   },
 
   "DefaultImagesSetting": {
     "pref": "profile.managed_default_content_settings.images",
     "test_policy": { "DefaultImagesSetting": 2 },
@@ skipping 617 matching lines @@
     "os": []
   },
 
   "AdditionalLaunchParameters": {
     "pref": null,
     "test_policy": { "AdditionalLaunchParameters": "--enable-media-stream" },
     "settings_pages": [],
     "os": []
   }
 }