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

Source/modules/bluetooth/BluetoothSupplement.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/BluetoothSupplement.h"
+
+#include "core/frame/LocalDOMWindow.h"
+#include "public/platform/Platform.h"
+
+namespace blink {
+
+const char* BluetoothSupplement::supplementName()
+{
+    return "BluetoothSupplement";
+}
+
+BluetoothSupplement::BluetoothSupplement(WebBluetooth* bluetooth)
+    : m_bluetooth(bluetooth)
+{
+}
+
+void BluetoothSupplement::provideTo(LocalFrame& frame, WebBluetooth* bluetooth)
+{
+    OwnPtrWillBeRawPtr<BluetoothSupplement> bluetoothSupplement = adoptPtrWillBeNoop(new BluetoothSupplement(bluetooth));
+    WillBeHeapSupplement<LocalFrame>::provideTo(frame, supplementName(), bluetoothSupplement.release());
+};
+
+WebBluetooth* BluetoothSupplement::from(ScriptState* scriptState)
+{
+    LocalDOMWindow* window = scriptState->domWindow();
+    if (window && window->frame()) {
+        BluetoothSupplement* supplement = static_cast<BluetoothSupplement*>(WillBeHeapSupplement<LocalFrame>::from(window->frame(), supplementName()));
+        if (supplement && supplement->m_bluetooth)
+            return supplement->m_bluetooth;
+    }
+    return Platform::current()->bluetooth();
+}
+
+DEFINE_TRACE(BluetoothSupplement)
+{
+    WillBeHeapSupplement<LocalFrame>::trace(visitor);
+}
+
+}; // blink