Add Get/SetDisplayLayout to chrome.system.display extension API

extensions/browser/extension_function_histogram_value.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_EXTENSION_FUNCTION_HISTOGRAM_VALUE_H_
 #define EXTENSIONS_BROWSER_EXTENSION_FUNCTION_HISTOGRAM_VALUE_H_
 
 namespace extensions {
 namespace functions {
 
@@ skipping 1177 matching lines @@
   BLUETOOTHLOWENERGY_SENDREQUESTRESPONSE,
   BLUETOOTHLOWENERGY_NOTIFYCHARACTERISTICVALUECHANGED,
   BLUETOOTHLOWENERGY_REMOVESERVICE,
   AUTOFILLPRIVATE_GETADDRESSLIST,
   AUTOFILLPRIVATE_GETCREDITCARDLIST,
   SYSTEM_DISPLAY_OVERSCANCALIBRATIONSTART,
   SYSTEM_DISPLAY_OVERSCANCALIBRATIONADJUST,
   SYSTEM_DISPLAY_OVERSCANCALIBRATIONRESET,
   SYSTEM_DISPLAY_OVERSCANCALIBRATIONCOMPLETE,
   AUTOFILLPRIVATE_GETCOUNTRYLIST,
+  SYSTEM_DISPLAY_SETDISPLAYLAYOUT,
+  SYSTEM_DISPLAY_GETDISPLAYLAYOUT,
   // Last entry: Add new entries above, then run:
   // python tools/metrics/histograms/update_extension_histograms.py
   ENUM_BOUNDARY
 };
 
 }  // namespace functions
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_EXTENSION_FUNCTION_HISTOGRAM_VALUE_H_