Attach a WebBluetooth to the LocalFrame and use it if it's available.

Source/modules/bluetooth/BluetoothGATTCharacteristic.cpp

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "modules/bluetooth/BluetoothGATTCharacteristic.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/BluetoothSupplement.h"
 #include "modules/bluetooth/ConvertWebVectorToArrayBuffer.h"
-#include "public/platform/Platform.h"
 #include "public/platform/modules/bluetooth/WebBluetooth.h"
 
 namespace blink {
 
 BluetoothGATTCharacteristic::BluetoothGATTCharacteristic(PassOwnPtr<WebBluetoothGATTCharacteristic> webCharacteristic)
     : m_webCharacteristic(webCharacteristic)
 {
 }
 
 BluetoothGATTCharacteristic* BluetoothGATTCharacteristic::take(ScriptPromiseResolver*, PassOwnPtr<WebBluetoothGATTCharacteristic> webCharacteristic)
 {
     if (!webCharacteristic) {
         return nullptr;
     }
     return new BluetoothGATTCharacteristic(webCharacteristic);
 }
 
 ScriptPromise BluetoothGATTCharacteristic::readValue(ScriptState* scriptState)
 {
-    WebBluetooth* webbluetooth = Platform::current()->bluetooth();
+    WebBluetooth* webbluetooth = BluetoothSupplement::from(scriptState);
 
     RefPtrWillBeRawPtr<ScriptPromiseResolver> resolver = ScriptPromiseResolver::create(scriptState);
     ScriptPromise promise = resolver->promise();
     webbluetooth->readValue(m_webCharacteristic->characteristicInstanceID, new CallbackPromiseAdapter<ConvertWebVectorToArrayBuffer, BluetoothError>(resolver));
 
     return promise;
 }
 
 ScriptPromise BluetoothGATTCharacteristic::writeValue(ScriptState* scriptState, const DOMArrayPiece& value)
 {
-    WebBluetooth* webbluetooth = Platform::current()->bluetooth();
+    WebBluetooth* webbluetooth = BluetoothSupplement::from(scriptState);
     // Partial implementation of writeValue algorithm:
     // https://webbluetoothchrome.github.io/web-bluetooth/#dom-bluetoothgattcharacteristic-writevalue
 
     // Let valueVector be a copy of the bytes held by value.
     std::vector<uint8_t> valueVector(value.bytes(), value.bytes() + value.byteLength());
     // If bytes is more than 512 bytes long (the maximum length of an attribute
     // value, per Long Attribute Values) return a promise rejected with an
     // InvalidModificationError and abort.
     if (valueVector.size() > 512)
         return ScriptPromise::rejectWithDOMException(scriptState, DOMException::create(InvalidModificationError, "Value can't exceed 512 bytes."));
 
     RefPtrWillBeRawPtr<ScriptPromiseResolver> resolver = ScriptPromiseResolver::create(scriptState);
 
     ScriptPromise promise = resolver->promise();
     webbluetooth->writeValue(m_webCharacteristic->characteristicInstanceID, valueVector, new CallbackPromiseAdapter<void, BluetoothError>(resolver));
 
     return promise;
 }
 
 } // namespace blink