MD Settings: Display: Add unified desktop control and modify 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>
 
@@ skipping 21 matching lines @@
 
   // 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;
+  DisplayUnitInfoList GetAllDisplaysInfo(bool single_unified) 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;
   bool ShowNativeTouchCalibration(
       const std::string& id, std::string* error,
       const TouchCalibrationCallback& callback) override;
@@ skipping 19 matching lines @@
 
   std::string touch_calibration_target_id_;
   bool custom_touch_calibration_active_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(DisplayInfoProviderChromeOS);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_DISPLAY_INFO_PROVIDER_CHROMEOS_H_