Add UMA for the number of devices in the chooser when a device is paired

content/public/browser/web_contents_delegate.h

Index: content/public/browser/web_contents_delegate.h
diff --git a/content/public/browser/web_contents_delegate.h b/content/public/browser/web_contents_delegate.h
index 9d3db1efb792cc6c6efcb6a5be7fc41cec5e4e65..7386d09475abad99693902260d35bc231d538f5f 100644
--- a/content/public/browser/web_contents_delegate.h
+++ b/content/public/browser/web_contents_delegate.h
@@ -374,7 +374,8 @@ class CONTENT_EXPORT WebContentsDelegate {
   // observer must live at least as long as the returned chooser object.
   virtual std::unique_ptr<BluetoothChooser> RunBluetoothChooser(
       RenderFrameHost* frame,
-      const BluetoothChooser::EventHandler& event_handler);
+      const BluetoothChooser::EventHandler& event_handler,
+      bool accept_all_devices);
 
   // Returns true if the delegate will embed a WebContents-owned fullscreen
   // render widget.  In this case, the delegate may access the widget by calling