bluetooth: Update BluetoothGATTCharacteristic.value on writeValue

third_party/WebKit/LayoutTests/bluetooth/writeValue.html

Index: third_party/WebKit/LayoutTests/bluetooth/writeValue.html
diff --git a/third_party/WebKit/LayoutTests/bluetooth/writeValue.html b/third_party/WebKit/LayoutTests/bluetooth/writeValue.html
index 881cf22d62f2c39f9ec63fc17988ae0183d6bd49..992784d78dffb8186895d01fa205dad04982bde6 100644
--- a/third_party/WebKit/LayoutTests/bluetooth/writeValue.html
+++ b/third_party/WebKit/LayoutTests/bluetooth/writeValue.html
@@ -98,4 +98,20 @@ promise_test(() => {
        characteristic.writeValue(new ArrayBuffer(1 /* length */)),
        characteristic.writeValue(new DataView(new ArrayBuffer(1 /* length */)))]));
 }, 'A regular write request to a writable characteristic should succeed.');
+
+promise_test(() => {
+  testRunner.setBluetoothMockDataSet('HeartRateAdapter');
+  return requestDeviceWithKeyDown({filters: [{services: ['heart_rate']}]})
+    .then(device => device.connectGATT())
+    .then(gattServer => gattServer.getPrimaryService('generic_access'))
+    .then(service => service.getCharacteristic('gap.device_name'))
+    .then(characteristic => {
+      assert_equals(characteristic.value, null);
+      let textEncoder = new TextEncoder();
+      let newValue = textEncoder.encode('foo');
+      return characteristic.writeValue(newValue).then(() => {
+        assert_array_equals(characteristic.value.buffer, newValue.buffer);
+      });
+    });
+}, 'A regular write request to a writable characteristic should update value.');
 </script>