Add in policy to control the PrintingEnabled pref

Bug:1066482

Change-Id: Icd89446475fd461fe3eb61a1079929b1dbe191b0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2337956
Commit-Queue: Andy Lu <andyhylu@google.com>
Reviewed-by: Owen Min <zmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795237}

components/policy/resources/policy_templates.json

@@ -2172,6 +2172,7 @@
       'type': 'main',
       'schema': { 'type': 'boolean' },
       'supported_on': ['chrome.*:8-', 'chrome_os:11-', 'android:39-'],
+      'future_on': [ 'ios' ],
       'features': {
         'dynamic_refresh': True,
         'per_profile': True,

ios/chrome/browser/policy/configuration_policy_handler_list_factory.mm

@@ -65,6 +65,9 @@ const PolicyToPreferenceMapEntry kSimplePolicyMap[] = {
   { policy::key::kPopupsBlockedForUrls,
     prefs::kManagedPopupsBlockedForUrls,
     base::Value::Type::LIST },
+  { policy::key::kPrintingEnabled,
+    prefs::kPrintingEnabled,
+    base::Value::Type::BOOLEAN },
   { policy::key::kSafeBrowsingEnabled,
     prefs::kSafeBrowsingEnabled,
     base::Value::Type::BOOLEAN },

ios/chrome/test/data/policy/policy_test_cases.json

@@ -339,6 +339,28 @@
      ]
    },
 
+  "PrintingEnabled":{
+      "os":["ios"],
+      "policy_pref_mapping_test":[
+          {
+              "policies":{"PrintingEnabled": true},
+              "prefs":{
+                "printing.enabled":{
+                  "value": true
+              } 
+            }
+          },
+          {
+              "policies":{"PrintingEnabled": false},
+              "prefs":{
+                "printing.enabled":{
+                  "value": false
+              } 
+            }
+          }
+      ]
+  },
+
   "SafeBrowsingEnabled": {
     "os": [ "ios" ],
     "can_be_recommended": true,