bluetooth: Add disconnect function

third_party/WebKit/LayoutTests/bluetooth/getPrimaryService.html

Index: third_party/WebKit/LayoutTests/bluetooth/getPrimaryService.html
diff --git a/third_party/WebKit/LayoutTests/bluetooth/getPrimaryService.html b/third_party/WebKit/LayoutTests/bluetooth/getPrimaryService.html
index 389a12e0536bed953664a844f236c5169f32fe61..5a282f32a3beaa56033b013e38a5d42714952dc0 100644
--- a/third_party/WebKit/LayoutTests/bluetooth/getPrimaryService.html
+++ b/third_party/WebKit/LayoutTests/bluetooth/getPrimaryService.html
@@ -5,6 +5,15 @@
 <script>
 'use strict'
 
+// Services Discovered
+// We use a connection to trigger a service discovered event and test
+// getPrimaryService. Sometimes the previous test left a connection to the
+// device open, so the event doesn't get triggered. To avoid this some tests
+// clean the state before starting the test.
+// In the future we will avoid this by
+// (1) Separating each test into it's own file. http://crbug.com/554240
+// (2) Implementing Dynamic mocks so that we can trigger the
+//     discovery event manually. http://crbug.com/569709
 test(t => { assert_true(window.testRunner instanceof Object); t.done(); },
      'window.testRunner is required for the following tests.');
 
@@ -23,6 +32,8 @@ promise_test(() => {
 }, 'Device goes out of range. Reject with NetworkError.');
 
 promise_test(() => {
+  // See Services Discovered note above.
+  testRunner.setBluetoothMockDataSet('');
   testRunner.setBluetoothMockDataSet('HeartRateAdapter');
   let expected = new DOMException('Service not found in device.',
                                   'NotFoundError');
@@ -38,13 +49,7 @@ promise_test(() => {
 }, 'Request for wrong service. Reject with NotFoundError.');
 
 promise_test(() => {
-  // Because state doesn't get cleaned after each test in a file, we need to
-  // clean it ourselves. In this case, the services for a HeartRateDevice had
-  // been discovered in the previous test, since the state doesn't get cleaned
-  // it appears as if the services had been discovered for the device in this
-  // test.
-  // TODO(ortuno): split tests into different files.
-  // http://crbug.com/554240
+  // See services discovered note above.
   testRunner.setBluetoothMockDataSet('');
   testRunner.setBluetoothMockDataSet('DelayedServicesDiscoveryAdapter');
   return requestDeviceWithKeyDown({filters: [{services: ['heart_rate']}]})