WebUsb Android chooser UI

chrome/browser/usb/web_usb_histograms.cc

Index: chrome/browser/usb/web_usb_histograms.cc
diff --git a/chrome/browser/usb/web_usb_histograms.cc b/chrome/browser/usb/web_usb_histograms.cc
new file mode 100644
index 0000000000000000000000000000000000000000..a330c7a0c003ea47700d36d0b073959cd5d13458
--- /dev/null
+++ b/chrome/browser/usb/web_usb_histograms.cc
@@ -0,0 +1,12 @@
+// Copyright 2016 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.
+
+#include "chrome/browser/usb/web_usb_histograms.h"
+
+#include "base/metrics/histogram_macros.h"
+
+void RecordWebUsbChooserClosure(WebUsbChooserClosed disposition) {
+  UMA_HISTOGRAM_ENUMERATION("WebUsb.ChooserClosed", disposition,
+                            WEBUSB_CHOOSER_CLOSED_MAX);
+}