Implement the private API for quick unlock.

extensions/browser/extension_event_histogram_value.h

 // Copyright 2015 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_EXTENSION_EVENT_HISTOGRAM_VALUE_H_
 #define EXTENSIONS_BROWSER_EXTENSION_EVENT_HISTOGRAM_VALUE_H_
 
 namespace extensions {
 namespace events {
 
@@ skipping 402 matching lines @@
   DISPLAY_SOURCE_ON_SINKS_UPDATED,
   INPUT_IME_ON_COMPOSITION_BOUNDS_CHANGED,
   INPUT_METHOD_PRIVATE_ON_IME_MENU_ACTIVATION_CHANGED,
   INPUT_METHOD_PRIVATE_ON_IME_MENU_LIST_CHANGED,
   INPUT_METHOD_PRIVATE_ON_IME_MENU_ITEMS_CHANGED,
   BLUETOOTH_LOW_ENERGY_ON_CHARACTERISTIC_READ_REQUEST,
   BLUETOOTH_LOW_ENERGY_ON_CHARACTERISTIC_WRITE_REQUEST,
   BLUETOOTH_LOW_ENERGY_ON_DESCRIPTOR_READ_REQUEST,
   BLUETOOTH_LOW_ENERGY_ON_DESCRIPTOR_WRITE_REQUEST,
   ACCESSIBILITY_PRIVATE_ON_ACCESSIBILITY_GESTURE,
+  QUICK_UNLOCK_PRIVATE_ON_ACTIVE_MODES_CHANGED,
   // Last entry: Add new entries above, then run:
   // python tools/metrics/histograms/update_extension_histograms.py
   ENUM_BOUNDARY
 };
 
 }  // namespace events
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_EXTENSION_EVENT_HISTOGRAM_VALUE_H_