Implement WebBluetooth descriptor.readValue()

third_party/WebKit/public/platform/modules/bluetooth/web_bluetooth.mojom

Index: third_party/WebKit/public/platform/modules/bluetooth/web_bluetooth.mojom
diff --git a/third_party/WebKit/public/platform/modules/bluetooth/web_bluetooth.mojom b/third_party/WebKit/public/platform/modules/bluetooth/web_bluetooth.mojom
index ecacfdb945c0b1af77877dba8cfed1a6700d2316..ecd821f7ccdecce6be74a86ea2c54fbbd76255af 100644
--- a/third_party/WebKit/public/platform/modules/bluetooth/web_bluetooth.mojom
+++ b/third_party/WebKit/public/platform/modules/bluetooth/web_bluetooth.mojom
@@ -72,6 +72,7 @@ enum WebBluetoothResult {
   REQUEST_DEVICE_WITH_BLOCKLISTED_UUID,
   REQUEST_DEVICE_FROM_CROSS_ORIGIN_IFRAME,
   REQUEST_DEVICE_WITHOUT_FRAME,
+  DESCRIPTOR_NO_LONGER_EXISTS,
 };
 
 struct WebBluetoothScanFilter {
@@ -198,6 +199,16 @@ interface WebBluetoothService {
     bluetooth.mojom.UUID? descriptor_uuid) => (
       WebBluetoothResult result,
       array<WebBluetoothRemoteGATTDescriptor>? descriptors);
+
+  // Reads the value for descriptor with |descriptor_instance_id|.

[scheib, 2017/01/19 06:16:18]

See comment style template change in tip of tree, made in this patch:
https://codereview.chromium.org/2635473004

[dougt, 2017/01/20 03:17:24]

Done.

+  // If the value is successfully read the callback will be run with
+  // WebBluetoothResult::SUCCESS and the descriptor's value. If the value is not
+  // successfully read the callback with be run with the corresponding error and
+  // nullptr for value.
+  RemoteDescriptorReadValue(
+    string descriptor_instance_id) => (
+    WebBluetoothResult result,
+    array<uint8>? value);
 };
 
 // Classes should implement this interface and pass an associated pointer