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

extensions/browser/api/system_display/display_info_provider.cc

 // Copyright 2013 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 "extensions/browser/api/system_display/display_info_provider.h"
 
 #include "base/strings/string_number_conversions.h"
 #include "extensions/common/api/system_display.h"
 #include "ui/display/display.h"
 #include "ui/display/screen.h"
@@ skipping 55 matching lines @@
   unit.bounds.top = bounds.y();
   unit.bounds.width = bounds.width();
   unit.bounds.height = bounds.height();
   unit.work_area.left = work_area.x();
   unit.work_area.top = work_area.y();
   unit.work_area.width = work_area.width();
   unit.work_area.height = work_area.height();
   return unit;
 }
 
+bool DisplayInfoProvider::SetDisplayLayout(const DisplayLayoutList& layout) {
+  NOTREACHED();  // Implemented on Chrome OS only in override.
+  return false;
+}
+
 void DisplayInfoProvider::EnableUnifiedDesktop(bool enable) {}
 
-DisplayUnitInfoList DisplayInfoProvider::GetAllDisplaysInfo() {
+DisplayInfoProvider::DisplayUnitInfoList
+DisplayInfoProvider::GetAllDisplaysInfo() {
   display::Screen* screen = display::Screen::GetScreen();
   int64_t primary_id = screen->GetPrimaryDisplay().id();
   std::vector<display::Display> displays = screen->GetAllDisplays();
   DisplayUnitInfoList all_displays;
   for (const display::Display& display : displays) {
     api::system_display::DisplayUnitInfo unit =
         CreateDisplayUnitInfo(display, primary_id);
     UpdateDisplayUnitInfoForPlatform(display, &unit);
     all_displays.push_back(std::move(unit));
   }
   return all_displays;
 }
 
+DisplayInfoProvider::DisplayLayoutList DisplayInfoProvider::GetDisplayLayout() {
+  NOTREACHED();  // Implemented on Chrome OS only in override.
+  return DisplayLayoutList();
+}
+
 bool DisplayInfoProvider::OverscanCalibrationStart(const std::string& id) {
   return false;
 }
 
 bool DisplayInfoProvider::OverscanCalibrationAdjust(
     const std::string& id,
     const api::system_display::Insets& delta) {
   return false;
 }
 
 bool DisplayInfoProvider::OverscanCalibrationReset(const std::string& id) {
   return false;
 }
 
 bool DisplayInfoProvider::OverscanCalibrationComplete(const std::string& id) {
   return false;
 }
 
 DisplayInfoProvider::DisplayInfoProvider() {
 }
 
 }  // namespace extensions