Add policy for ash launcher auto-hide behavior

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 a6c0a1ad8bc570d53553c96d637f28e2a9aa37ad..6e5e9f0be3c26b841c5d3f0850493f9ef55c0b5f 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: 163
+#   For your editing convenience: highest ID currently used: 164
 #
 # Placeholders:
 #   The following placeholder strings are automatically substituted:
@@ -3284,6 +3284,46 @@
 
       The format of the value follows the names of timezones in the "IANA Time Zone Database" (see "http://en.wikipedia.org/wiki/List_of_tz_database_time"). In particular, most timezones can be referred to by "continent/large_city" or "ocean/large_city".''',
     },
+    {
+      'name': 'ShelfAutoHideBehavior',
+      'type': 'string-enum',
+      'schema': {
+        'type': 'string',
+        'enum': [
+          'Always',
+          'Never'
+        ],
+      },
+      'items': [
+        {
+          'name': 'AlwaysAutoHideShelf',
+          'value': 'Always',
+          'caption': '''Always auto-hide the shelf''',
+        },
+        {
+          'name': 'NeverAutoHideShelf',
+          'value': 'Never',
+          'caption': '''Never auto-hide the shelf''',
+        },
+      ],
+      'supported_on': ['chrome_os:25-'],
+      'features': {
+        'dynamic_refresh': True,
+        'can_be_recommended': True,
+      },
+      'example_value': 'Always',
+      'id': 164,
+      'caption': '''Control shelf auto-hiding''',
+      'desc': '''Control auto-hiding of the <ph name="PRODUCT_OS_NAME">$2<ex>Google Chrome OS</ex></ph> shelf.
+
+      If this policy is set to 'AlwaysAutoHideShelf', the shelf will always auto-hide.
+
+      If this policy is set to 'NeverAutoHideShelf', the shelf never auto-hide.
+
+      If you set this policy, users cannot change or override it.
+
+      If the policy is left not set, users can choose whether the shelf should auto-hide.''',
+    },
   ],
   'messages': {
     # Messages that are not associated to any policies.