Add a SafeSearch preference, policy and implementation.

chrome/app/policy/policy_templates.json

Index: chrome/app/policy/policy_templates.json
diff --git a/chrome/app/policy/policy_templates.json b/chrome/app/policy/policy_templates.json
index 4b9e8edac68da7fb983afcc41b2df5052a8b8c2d..aa0a606bc19c67df02380d0fbe23bf011a3e12fe 100644
--- a/chrome/app/policy/policy_templates.json
+++ b/chrome/app/policy/policy_templates.json
@@ -112,7 +112,7 @@
 #   persistent IDs for all fields (but not for groups!) are needed. These are
 #   specified by the 'id' keys of each policy. NEVER CHANGE EXISTING IDs,
 #   because doing so would break the deployed wire format!
-#   For your editing convenience: highest ID currently used: 161
+#   For your editing convenience: highest ID currently used: 162
 #
 # Placeholders:
 #   The following placeholder strings are automatically substituted:
@@ -557,6 +557,24 @@
       If this policy is left not set, this will be enabled but the user will be able to change it.''',
     },
     {
+      'name': 'ForceSafeSearch',
+      'type': 'main',
+      'schema': { 'type': 'boolean' },
+      'supported_on': ['chrome.*:24-', 'chrome_os:0.24-'],
+      'features': {
+        'dynamic_refresh': True,
+        'can_be_recommended': False,
+      },
+      'example_value': False,
+      'id': 162,
+      'caption': '''Force SafeSearch''',
+      'desc': '''Forces users to do queries in Google Web Search with SafeSearch set to active and prevents users from changing this setting.

[Bernhard Bauer, 2012/10/17 15:23:54]

We don't really force users to do something, we force queries to have the
SafeSearch setting active ;-)

[Sergiu, 2012/10/19 08:40:55]

Done.

+
+      If you enable this setting, SafeSearch in Google Search is always active.
+
+      If you disable this setting, SafeSearch in Google Search is not enforced.''',
+    },
+    {
       'name': 'SafeBrowsingEnabled',
       'type': 'main',
       'schema': { 'type': 'boolean' },