blink: permissions: add tests for request

LayoutTests/http/tests/permissions/chromium/resources/test-request.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');
+}
+
+var tests = [
+{
+    test: async_test('Test PermissionDescription WebIDL rules in ' + get_current_scope() + ' scope.'),
+    fn: function(callback) {
+        // Requesting a random permission name should fail.
+        navigator.permissions.request({name:'foobar'}).then(function(result) {
+            assert_unreached('requesting a random permission should fail');
+            callback();

[mlamouri (slow - plz ping), 2015/07/24 14:31:12]

Can you call throw and pass the message then at the end of the promise chain,
you can have a .catch() that will grab the exception, show the message passed to
it and call callback().

[Lalit Maganti, 2015/07/30 10:10:14]

Done.

+        }, function(error) {
+            assert_equals(error.name, 'TypeError');
+
+            // Querying a permission without a name should fail.
+            return navigator.permissions.request({});
+        }).then(function(result) {
+            assert_unreached('requesting a permission without a name should fail');
+            callback();
+        }, function(error) {
+            assert_equals(error.name, 'TypeError');
+            callback();
+        });
+    }
+},
+{
+    test: async_test('Test geolocation permission in ' + get_current_scope() + ' scope.'),

[mlamouri (slow - plz ping), 2015/07/24 14:31:12]

'Test basic request behaviour in [...]

And add a comment explaining why this test only:
// request() is expected to show a UI then return the new permission status.
// In layout tests no UI is shown so it boils down to returning the permission
// status. The tests only check that behaviour given that trying to simulate
// user decision would simply test the test infrastructure.

[Lalit Maganti, 2015/07/30 10:10:14]

Done.

+    fn: function(callback) {
+      navigator.permissions.request({name:'geolocation'}).then(function(result) {
+          assert_true(result instanceof PermissionStatus);
+          assert_equals(result.state, 'denied');
+
+          result.onchange = function() {
+              assert_equals(result.state, 'granted');
+
+              navigator.permissions.request({name:'geolocation'}).then(function() {
+                  assert_true(result instanceof PermissionStatus);
+                  assert_equals(result.state, 'granted');
+                  callback();
+              }).catch(function() {
+                  assert_unreached('requesting geolocation permission should not fail.')
+                  callback();
+              });
+          };
+
+          setPermission('geolocation', 'granted', location.origin, location.origin)
+      }).catch(function() {
+          assert_unreached('requesting geolocation permission should not fail.')
+          callback();
+      });
+    }
+}];
+
+function runTest(i) {
+  tests[i].test.step(function() {
+      tests[i].fn(function() {
+          tests[i].test.done();
+          if (i + 1 < tests.length) {
+              runTest(i + 1);
+          } else {
+              done();
+          }
+      });
+  });
+}
+runTest(0);