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

chrome/browser/extensions/chrome_extensions_browser_client.h

Index: chrome/browser/extensions/chrome_extensions_browser_client.h
diff --git a/chrome/browser/extensions/chrome_extensions_browser_client.h b/chrome/browser/extensions/chrome_extensions_browser_client.h
index e54f28bc95882cb9ce063210bc186846bbc3b08d..6ec39f10bfa793f25ae4c5b44cc642390e259f41 100644
--- a/chrome/browser/extensions/chrome_extensions_browser_client.h
+++ b/chrome/browser/extensions/chrome_extensions_browser_client.h
@@ -119,7 +119,8 @@ class ChromeExtensionsBrowserClient : public ExtensionsBrowserClient {
       ExtensionApiFrameIdMap* map) override;
   std::unique_ptr<content::BluetoothChooser> CreateBluetoothChooser(
       content::RenderFrameHost* frame,
-      const content::BluetoothChooser::EventHandler& event_handler) override;
+      const content::BluetoothChooser::EventHandler& event_handler,
+      bool accept_all_devices) override;
   bool IsActivityLoggingEnabled(content::BrowserContext* context) override;
   extensions::ExtensionNavigationUIData* GetExtensionNavigationUIData(
       net::URLRequest* request) override;