Enable policy support for registering protocol handler.

chrome/test/data/policy/policy_test_cases.json

Index: chrome/test/data/policy/policy_test_cases.json
diff --git a/chrome/test/data/policy/policy_test_cases.json b/chrome/test/data/policy/policy_test_cases.json
index c2e49c9bd95078bb8d846dce359a0f1e2fecc39f..2508fc4051cdcddb08aea0f020126398416e6fc7 100644
--- a/chrome/test/data/policy/policy_test_cases.json
+++ b/chrome/test/data/policy/policy_test_cases.json
@@ -1575,6 +1575,28 @@
     ]
   },
 
+  "RegisteredProtocolHandlers": {
+    "os": ["win", "linux", "mac", "chromeos"],
+    "can_be_recommended": true,
+    "test_policy": { "RegisteredProtocolHandlers": {"protocol": "test", "url": "http://test.com/%s", "default": "true"} },

[bartfab (slow), 2014/06/06 12:01:57]

Nit: s/test.com/example.com/ (example.com is specifically reserved for such
purposes)

[kaliamoorthi, 2014/06/10 17:14:26]

Done.

+    "pref_mappings": [
+      { "pref": "custom_handlers.policy.registered_protocol_handlers",
+        "check_for_mandatory": false
+      }
+    ]
+  },
+
+  "IgnoredProtocolHandlers": {
+    "os": ["win", "linux", "mac", "chromeos"],
+    "can_be_recommended": true,
+    "test_policy": { "IgnoredProtocolHandlers": {"protocol": "test1", "url": "http://test1.com/%s"} },

[bartfab (slow), 2014/06/06 12:01:57]

Nit 1: s/test1.com/example.com/ (example.com is specifically reserved for such
purposes)
Nit 2: Why not use the same protocol "test" here? The two tests will be run
independently and will not get in each other's ways.

[kaliamoorthi, 2014/06/10 17:14:26]

Not relevant anymore

+    "pref_mappings": [
+      { "pref": "custom_handlers.policy.ignored_protocol_handlers",
+        "check_for_mandatory": false
+      }
+    ]
+  },
+
   "HideWebStoreIcon": {
     "os": ["win", "linux", "mac", "chromeos"],
     "test_policy": { "HideWebStoreIcon": true },