bluetooth: Blink-side implementation of getCharacteristic.

Source/modules/bluetooth/BluetoothGATTService.cpp

Index: Source/modules/bluetooth/BluetoothGATTService.cpp
diff --git a/Source/modules/bluetooth/BluetoothGATTService.cpp b/Source/modules/bluetooth/BluetoothGATTService.cpp
index 620b1bce5d390a9052d02a5dfc1e901028dadfa5..d8be80a21a4883d607027e21ceecc7ad86343071 100644
--- a/Source/modules/bluetooth/BluetoothGATTService.cpp
+++ b/Source/modules/bluetooth/BluetoothGATTService.cpp
@@ -5,7 +5,15 @@
 #include "config.h"
 #include "modules/bluetooth/BluetoothGATTService.h"
 
-#include "public/platform/modules/bluetooth/WebBluetoothGATTRemoteServer.h"
+#include "bindings/core/v8/CallbackPromiseAdapter.h"
+#include "bindings/core/v8/ScriptPromise.h"
+#include "bindings/core/v8/ScriptPromiseResolver.h"
+#include "core/dom/DOMException.h"
+#include "core/dom/ExceptionCode.h"
+#include "modules/bluetooth/BluetoothError.h"
+#include "modules/bluetooth/BluetoothGATTCharacteristic.h"
+#include "public/platform/Platform.h"
+#include "public/platform/modules/bluetooth/WebBluetooth.h"
 #include "wtf/OwnPtr.h"
 
 namespace blink {
@@ -29,4 +37,16 @@ void BluetoothGATTService::dispose(WebBluetoothGATTService* webService)
     delete webService;
 }
 
+ScriptPromise BluetoothGATTService::getCharacteristic(ScriptState* scriptState,
+    String characteristicUUID)
+{
+    WebBluetooth* webbluetooth = Platform::current()->bluetooth();
+    if (!webbluetooth)
+        return ScriptPromise::rejectWithDOMException(scriptState, DOMException::create(NotSupportedError));
+    RefPtrWillBeRawPtr<ScriptPromiseResolver> resolver = ScriptPromiseResolver::create(scriptState);
+    ScriptPromise promise = resolver->promise();
+    webbluetooth->getCharacteristic(m_webService.serviceInstanceID, characteristicUUID, new CallbackPromiseAdapter<BluetoothGATTCharacteristic, BluetoothError>(resolver));
+    return promise;
+}
+
 } // namespace blink