[sensors] Add Permission guard to the generic sensor apis.

third_party/WebKit/LayoutTests/http/tests/permissions/chromium/resources/test-revoke.js

 if (self.importScripts) {
     importScripts('../../resources/helpers.js');
     importScripts('testrunner-helpers.js');
 
     if (get_current_scope() == 'ServiceWorker')
         importScripts('../../../serviceworker/resources/worker-testharness.js');
     else
         importScripts('../../../resources/testharness.js');
 }
 
@@ skipping 52 matching lines @@
             assert_true(result instanceof PermissionStatus);
             assert_equals(result.state, DEFAULT_PERMISSION_STATE);
             callback();
         }).catch(function() {
             assert_unreached('revoking midi permission should not fail.')
             callback();
         });
     }
 },
 {
+    test: async_test('Test sensors permission in ' + get_current_scope() + ' scope.'),
+    fn: function(callback) {
+      setPermission('sensors', 'granted', location.origin, location.origin).then(function() {
+          return navigator.permissions.revoke({name:'sensors'});
+      }).then(function(result) {
+          assert_true(result instanceof PermissionStatus);
+          assert_equals(result.state, DEFAULT_PERMISSION_STATE);
+          callback();
+      }).catch(function() {
+          assert_unreached('revoking sensors permission should not fail.');
+          callback();
+      });
+    }
+},
+{
     test: async_test('Test push permission in ' + get_current_scope() + ' scope.'),
     fn: function(callback) {
         setPermission('push-messaging', 'granted', location.origin, location.origin).then(function() {
             return navigator.permissions.revoke({name:'push'});
         }).catch(function(e) {
             // By default, the permission revocation is rejected if "userVisibleOnly" option
             // isn't set or set to true.
             assert_equals(e.name, "NotSupportedError");
 
             // Test for userVisibleOnly=false.
@@ skipping 37 matching lines @@
           tests[i].test.done();
           if (i + 1 < tests.length) {
               runTest(i + 1);
           } else {
               done();
           }
       });
   });
 }
 runTest(0);