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

extensions/browser/api/system_display/display_info_provider.h

 // 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.
 
 #ifndef EXTENSIONS_BROWSER_API_SYSTEM_DISPLAY_DISPLAY_INFO_PROVIDER_H_
 #define EXTENSIONS_BROWSER_API_SYSTEM_DISPLAY_DISPLAY_INFO_PROVIDER_H_
 
 #include <stdint.h>
 
 #include <string>
 #include <vector>
 
 #include "base/macros.h"
 
 namespace display {
 class Display;
 }
 
 namespace extensions {
 
 namespace api {
 namespace system_display {
+struct DisplayLayout;
 struct DisplayProperties;
 struct DisplayUnitInfo;
 struct Insets;
 }
 }
 
-typedef std::vector<api::system_display::DisplayUnitInfo> DisplayUnitInfoList;
-
 class DisplayInfoProvider {
  public:
+  using DisplayUnitInfoList = std::vector<api::system_display::DisplayUnitInfo>;
+  using DisplayLayoutList = std::vector<api::system_display::DisplayLayout>;
+
   virtual ~DisplayInfoProvider();
 
   // Returns a pointer to DisplayInfoProvider or NULL if Create()
   // or InitializeForTesting() or not called yet.
   static DisplayInfoProvider* Get();
 
   // This is for tests that run in its own process (e.g. browser_tests).
   // Using this in other tests (e.g. unit_tests) will result in DCHECK failure.
   static void InitializeForTesting(DisplayInfoProvider* display_info_provider);
 
   // Updates the display with |display_id| according to |info|. Returns whether
   // the display was successfully updated. On failure, no display parameters
   // should be changed, and |error| should be set to the error string.
   virtual bool SetInfo(const std::string& display_id,
                        const api::system_display::DisplayProperties& info,
                        std::string* error) = 0;
 
-  // Enable the unified desktop feature.
+  // Implements SetDisplayLayout methods. See system_display.idl. Returns
+  // false if the layout input is invalid.
+  virtual bool SetDisplayLayout(const DisplayLayoutList& layouts);
+
+  // Enables the unified desktop feature.
   virtual void EnableUnifiedDesktop(bool enable);
 
-  // Get display information.
+  // Gets display information.
   virtual DisplayUnitInfoList GetAllDisplaysInfo();
 
-  // Implement overscan calbiration methods. See system_display.idl. These
+  // Gets display layout information.
+  virtual DisplayLayoutList GetDisplayLayout();
+
+  // Implements overscan calbiration methods. See system_display.idl. These
   // return false if |id| is invalid.
   virtual bool OverscanCalibrationStart(const std::string& id);
   virtual bool OverscanCalibrationAdjust(
       const std::string& id,
       const api::system_display::Insets& delta);
   virtual bool OverscanCalibrationReset(const std::string& id);
   virtual bool OverscanCalibrationComplete(const std::string& id);
 
  protected:
   DisplayInfoProvider();
@@ skipping 12 matching lines @@
   virtual void UpdateDisplayUnitInfoForPlatform(
       const display::Display& display,
       api::system_display::DisplayUnitInfo* unit) = 0;
 
   DISALLOW_COPY_AND_ASSIGN(DisplayInfoProvider);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_API_SYSTEM_DISPLAY_DISPLAY_INFO_PROVIDER_H_