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..7d124c10eb3c6d002a804b73894dd2845b2b958f 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 +557,28 @@
       If this policy is left not set, this will be enabled but the user will be able to change it.''',
     },
     {
+      'name': 'SafeSearchEnabled',

[Bernhard Bauer, 2012/10/16 16:37:33]

I would be happier if we called this "ForceSafeSearch" or something. "Enabled"
sounds like the possibility of using SafeSearch (and conversely, setting the
policy to false would imply that SafeSearch can't be used, when in reality it
just means that it's not enforced).

[Sergiu, 2012/10/17 14:48:58]

Done.

+      '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': '''Enable SafeSearch''',
+      'desc': '''Enables <ph name="PRODUCT_NAME">$1<ex>Google Chrome</ex></ph>'s SafeSearch feature and prevents users from changing this setting.

[Joao da Silva, 2012/10/16 16:26:46]

SafeSearch is not a Google Chrome feature, it's a Google feature. Remove the
<ph> element and just write Google in its place.

[Sergiu, 2012/10/17 14:48:58]

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.
+
+      If you enable or disable this setting, users cannot change or override this setting in <ph name="PRODUCT_NAME">$1<ex>Google Chrome</ex></ph>.

[Bernhard Bauer, 2012/10/16 16:37:33]

This setting is not accessible to users at all.

[Sergiu, 2012/10/17 14:48:58]

Done.

+
+      If this policy is left not set users will be able to choose their own SafeSearch setting''',

[Joao da Silva, 2012/10/16 16:26:46]

End the sentence with a dot.

[Sergiu, 2012/10/17 14:48:58]

Done.

+    },
+    {
       'name': 'SafeBrowsingEnabled',
       'type': 'main',
       'schema': { 'type': 'boolean' },