Add ability to change display settings to chrome.systemInfo.display

chrome/browser/extensions/api/system_info_display/display_info_provider.h

Index: chrome/browser/extensions/api/system_info_display/display_info_provider.h
diff --git a/chrome/browser/extensions/api/system_info_display/display_info_provider.h b/chrome/browser/extensions/api/system_info_display/display_info_provider.h
index aab10c1cb4ed34e88eb1db52ff232752b713f35f..1024a7efd33a1fd25a98217479e87350e37929ba 100644
--- a/chrome/browser/extensions/api/system_info_display/display_info_provider.h
+++ b/chrome/browser/extensions/api/system_info_display/display_info_provider.h
@@ -17,6 +17,8 @@ class DisplayInfoProvider : public SystemInfoProvider<DisplayInfo> {
  public:
   typedef base::Callback<void(const DisplayInfo& info, bool success)>
       RequestInfoCallback;
+  typedef base::Callback<void(bool success, const std::string& error)>
+      SetInfoCallback;
 
   // Gets a DisplayInfoProvider instance.
   static DisplayInfoProvider* GetProvider();
@@ -27,6 +29,17 @@ class DisplayInfoProvider : public SystemInfoProvider<DisplayInfo> {
   // The implementation is platform specific.
   void RequestInfo(const RequestInfoCallback& callback);
 
+  // Updates the display parameters for a display with the provided id.
+  // The parameters are updated according to content of |info|. After the
+  // display is updated, callback is called with the success status, and error
+  // message. If the method succeeds, the error message is empty.
+  // The callback will be called asynchronously.
+  // This functionality is exposed only on ChromeOS.
+  virtual void SetInfo(
+      const std::string& display_id,
+      const api::system_info_display::SetDisplayUnitInfoParams& params,
+      const SetInfoCallback& callback);
+
  protected:
   // Overriden from SystemInfoProvider<DisplayInfo>.
   // The implementation is platform specific.