MD Settings: Display: Add unified desktop control and modify api

extensions/browser/api/system_display/display_info_provider.h

Index: extensions/browser/api/system_display/display_info_provider.h
diff --git a/extensions/browser/api/system_display/display_info_provider.h b/extensions/browser/api/system_display/display_info_provider.h
index e0c2a5f8afd33f0b560ca39e0c8353247bf57974..e6c4db5286301ef27c9c8e5841d3e81a90d8208a 100644
--- a/extensions/browser/api/system_display/display_info_provider.h
+++ b/extensions/browser/api/system_display/display_info_provider.h
@@ -60,8 +60,10 @@ class DisplayInfoProvider {
   // Enables the unified desktop feature.
   virtual void EnableUnifiedDesktop(bool enable);
 
-  // Gets display information.
-  virtual DisplayUnitInfoList GetAllDisplaysInfo();
+  // Returns a list of information for all displays. If |single_unified| is
+  // true, when in unified mode a single display will be returned representing
+  // the single unified desktop.
+  virtual DisplayUnitInfoList GetAllDisplaysInfo(bool single_unified);
 
   // Gets display layout information.
   virtual DisplayLayoutList GetDisplayLayout();