[iOS Enterprise] Add iOS support for the MetricsReportingEnabled policy

Adds support for the simple policy MetricsReportingEnabled.

Change-Id: Id9959f8c8ffae88483ae39a2d93cc9d11e0f47ab
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2404480Reviewed-by: Owen Min <zmin@chromium.org>
Reviewed-by: sebsg <sebsg@chromium.org>
Commit-Queue: Guillaume Jenkins <gujen@google.com>
Cr-Commit-Position: refs/heads/master@{#806192}

components/policy/resources/policy_templates.json

@@ -3042,6 +3042,7 @@
       'type': 'main',
       'schema': { 'type': 'boolean' },
       'supported_on': ['chrome.*:8-'],
+      'future_on': [ 'ios' ],
       'features': {
         'can_be_recommended': True,
         'dynamic_refresh': False,

ios/chrome/browser/policy/BUILD.gn

@@ -40,6 +40,7 @@ source_set("policy") {
     "//components/bookmarks/common",
     "//components/bookmarks/managed",
     "//components/enterprise",
+    "//components/metrics",
     "//components/password_manager/core/common",
     "//components/policy:generated",
     "//components/policy/core/common",
@@ -116,8 +117,8 @@ source_set("test_support") {
 
 bundle_data("test_resources") {
   visibility = [
-    ":unit_tests",
     ":eg2_tests",
+    ":unit_tests",
   ]
   testonly = true
   sources = [ "//ios/chrome/test/data/policy/policy_test_cases.json" ]

ios/chrome/browser/policy/configuration_policy_handler_list_factory.mm

@@ -12,6 +12,7 @@
 #include "components/bookmarks/managed/managed_bookmarks_policy_handler.h"
 #include "components/content_settings/core/common/pref_names.h"
 #include "components/enterprise/browser/reporting/common_pref_names.h"
+#include "components/metrics/metrics_pref_names.h"
 #include "components/password_manager/core/common/password_manager_pref_names.h"
 #include "components/policy/core/browser/configuration_policy_handler.h"
 #include "components/policy/core/browser/configuration_policy_handler_list.h"
@@ -59,6 +60,9 @@ const PolicyToPreferenceMapEntry kSimplePolicyMap[] = {
   { policy::key::kDefaultPopupsSetting,
     prefs::kManagedDefaultPopupsSetting,
     base::Value::Type::INTEGER },
+  { policy::key::kMetricsReportingEnabled,
+    metrics::prefs::kMetricsReportingEnabled,
+    base::Value::Type::BOOLEAN },
   { policy::key::kPopupsAllowedForUrls,
     prefs::kManagedPopupsAllowedForUrls,
     base::Value::Type::LIST },

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

@@ -308,6 +308,16 @@
     ]
   },
 
+  "MetricsReportingEnabled": {
+    "os": [ "ios" ],
+    "policy_pref_mapping_test": [
+      {
+        "policies": { "MetricsReportingEnabled": false },
+        "prefs": { "user_experience_metrics.reporting_enabled": { "local_state": true } }
+      }
+    ]
+  },
+
   "PasswordManagerEnabled": {
     "os": [ "ios" ],
     "can_be_recommended": true,
@@ -349,7 +359,7 @@
               "prefs":{
                 "printing.enabled":{
                   "value": true
-              } 
+              }
             }
           },
           {
@@ -357,7 +367,7 @@
               "prefs":{
                 "printing.enabled":{
                   "value": false
-              } 
+              }
             }
           }
       ]