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

chrome/browser/android/tab_web_contents_delegate_android.cc

Index: chrome/browser/android/tab_web_contents_delegate_android.cc
diff --git a/chrome/browser/android/tab_web_contents_delegate_android.cc b/chrome/browser/android/tab_web_contents_delegate_android.cc
index 9074acfe6329de24a2eeff4255d575f074e1fb83..59ea85c5481b7ef75e0ffc5915f543b69304bc89 100644
--- a/chrome/browser/android/tab_web_contents_delegate_android.cc
+++ b/chrome/browser/android/tab_web_contents_delegate_android.cc
@@ -127,7 +127,8 @@ void TabWebContentsDelegateAndroid::RunFileChooser(
 std::unique_ptr<BluetoothChooser>
 TabWebContentsDelegateAndroid::RunBluetoothChooser(
     content::RenderFrameHost* frame,
-    const BluetoothChooser::EventHandler& event_handler) {
+    const BluetoothChooser::EventHandler& event_handler,
+    bool accept_all_devices) {
   return base::MakeUnique<BluetoothChooserAndroid>(frame, event_handler);
 }