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

extensions/browser/app_window/app_window.h

 // Copyright 2014 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.
 
 #ifndef EXTENSIONS_BROWSER_APP_WINDOW_APP_WINDOW_H_
 #define EXTENSIONS_BROWSER_APP_WINDOW_APP_WINDOW_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 417 matching lines @@
   void HandleKeyboardEvent(
       content::WebContents* source,
       const content::NativeWebKeyboardEvent& event) override;
   void RequestToLockMouse(content::WebContents* web_contents,
                           bool user_gesture,
                           bool last_unlocked_by_target) override;
   bool PreHandleGestureEvent(content::WebContents* source,
                              const blink::WebGestureEvent& event) override;
   std::unique_ptr<content::BluetoothChooser> RunBluetoothChooser(
       content::RenderFrameHost* frame,
-      const content::BluetoothChooser::EventHandler& event_handler) override;
+      const content::BluetoothChooser::EventHandler& event_handler,
+      bool accept_all_devices) override;
 
   // content::WebContentsObserver implementation.
   void RenderViewCreated(content::RenderViewHost* render_view_host) override;
 
   // ExtensionFunctionDispatcher::Delegate implementation.
   WindowController* GetExtensionWindowController() const override;
   content::WebContents* GetAssociatedWebContents() const override;
 
   // ExtensionRegistryObserver implementation.
   void OnExtensionUnloaded(content::BrowserContext* browser_context,
@@ skipping 124 matching lines @@
   base::Closure on_first_commit_callback_;
 
   base::WeakPtrFactory<AppWindow> image_loader_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(AppWindow);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_APP_WINDOW_APP_WINDOW_H_