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

public/web/WebFrameClient.h

Index: public/web/WebFrameClient.h
diff --git a/public/web/WebFrameClient.h b/public/web/WebFrameClient.h
index 2d8ecb536e861514e5664f4041482c1efaabe7e0..47bfa0008a73e81dae754f71cdeb27f28fb968d8 100644
--- a/public/web/WebFrameClient.h
+++ b/public/web/WebFrameClient.h
@@ -60,6 +60,7 @@ enum class WebTreeScopeType;
 class WebApplicationCacheHost;
 class WebApplicationCacheHostClient;
 class WebAppBannerClient;
+class WebBluetooth;
 class WebCachedURLRequest;
 class WebColorChooser;
 class WebColorChooserClient;
@@ -669,6 +670,9 @@ public:
         return WebCustomHandlersNew;
     }
 
+    // Bluetooth -----------------------------------------------------------
+    virtual WebBluetooth* bluetooth() { return 0; }
+
 protected:
     virtual ~WebFrameClient() { }
 };