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

chrome/browser/extensions/display_info_provider_chromeos.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 CHROME_BROWSER_EXTENSIONS_DISPLAY_INFO_PROVIDER_CHROMEOS_H_
 #define CHROME_BROWSER_EXTENSIONS_DISPLAY_INFO_PROVIDER_CHROMEOS_H_
 
 #include <map>
 #include <memory>
 
 #include "base/macros.h"
 #include "extensions/browser/api/system_display/display_info_provider.h"
 
 namespace chromeos {
 class OverscanCalibrator;
 }
 
 namespace extensions {
 
 class DisplayInfoProviderChromeOS : public DisplayInfoProvider {
  public:
   DisplayInfoProviderChromeOS();
   ~DisplayInfoProviderChromeOS() override;
 
   // DisplayInfoProvider implementation.
   bool SetInfo(const std::string& display_id,
                const api::system_display::DisplayProperties& info,
                std::string* error) override;
+  bool SetDisplayLayout(const DisplayLayoutList& layouts) override;
   void UpdateDisplayUnitInfoForPlatform(
       const display::Display& display,
       api::system_display::DisplayUnitInfo* unit) override;
   void EnableUnifiedDesktop(bool enable) override;
   DisplayUnitInfoList GetAllDisplaysInfo() override;
+  DisplayLayoutList GetDisplayLayout() override;
   bool OverscanCalibrationStart(const std::string& id) override;
   bool OverscanCalibrationAdjust(
       const std::string& id,
       const api::system_display::Insets& delta) override;
   bool OverscanCalibrationReset(const std::string& id) override;
   bool OverscanCalibrationComplete(const std::string& id) override;
 
  private:
   std::map<std::string, std::unique_ptr<chromeos::OverscanCalibrator>>
       overscan_calibrators_;
 
   chromeos::OverscanCalibrator* GetCalibrator(const std::string& id);
 
   DISALLOW_COPY_AND_ASSIGN(DisplayInfoProviderChromeOS);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_DISPLAY_INFO_PROVIDER_CHROMEOS_H_