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

extensions/browser/extensions_browser_client.h

Index: extensions/browser/extensions_browser_client.h
diff --git a/extensions/browser/extensions_browser_client.h b/extensions/browser/extensions_browser_client.h
index 5ddbde70f6bb7e88071e2e6b119ebeed6427e785..b1e2f43f64e58a5ae88130bba7af3cecb2ebf070 100644
--- a/extensions/browser/extensions_browser_client.h
+++ b/extensions/browser/extensions_browser_client.h
@@ -252,7 +252,8 @@ class ExtensionsBrowserClient {
 
   virtual std::unique_ptr<content::BluetoothChooser> CreateBluetoothChooser(
       content::RenderFrameHost* frame,
-      const content::BluetoothChooser::EventHandler& event_handler);
+      const content::BluetoothChooser::EventHandler& event_handler,
+      bool accept_all_devices);
 
   // Returns true if activity logging is enabled for the given |context|.
   virtual bool IsActivityLoggingEnabled(content::BrowserContext* context);