Add a policy to always show the Cast toolbar icon

components/policy/resources/policy_templates.json

Index: components/policy/resources/policy_templates.json
diff --git a/components/policy/resources/policy_templates.json b/components/policy/resources/policy_templates.json
index c80aa29e3e50701d69ccb451a71208b8c22a977f..9b0b39db3653e2d1ea3c03da6ac0e867d6ce9025 100644
--- a/components/policy/resources/policy_templates.json
+++ b/components/policy/resources/policy_templates.json
@@ -139,7 +139,7 @@
 #   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: 360
+#   For your editing convenience: highest ID currently used: 361
 #   And don't forget to also update the EnterprisePolicies enum of
 #   histograms.xml.
 #
@@ -9449,6 +9449,25 @@
 
       If the device wallpaper policy is left not set, it's the user's wallpaper policy to decide what to show if the user's wallpaper policy is set.''',
     },
+    {
+      'name': 'ShowCastIconInToolbar',

[pastarmovj, 2017/01/24 23:03:46]

Please move this policy right after the EnableMediaRouter policy and consider
grouping them in a group called "Chrome Cast" or some such.

[takumif, 2017/01/26 23:12:35]

Putting them in a group 'Google Cast'.

+      'type': 'main',
+      'schema': { 'type': 'boolean' },
+      'supported_on': ['chrome.*:57-', 'chrome_os:57-'],
+      'features': {
+        'dynamic_refresh': False,
+        'per_profile': True,
+      },
+      'example_value': False,
+      'id': 361,
+      'caption': '''Shows the Cast toolbar icon''',
+      'tags': [],
+      'desc': '''If this policy is set to true, the Cast toolbar icon will always be shown on the toolbar or the overflow menu, and users will not be able to remove it.
+
+      If this policy is set to false or not set, users will be able to pin or remove the icon via its contextual menu.
+
+      If the policy "EnableMediaRouter" is set to false, then this policy's value would have no effect, and the toolbar icon would not be shown.'''
+    },
   ],
   'messages': {
     # Messages that are not associated to any policies.