Switch primary display

ui/aura/display_manager.h

Index: ui/aura/display_manager.h
diff --git a/ui/aura/display_manager.h b/ui/aura/display_manager.h
index 41a5e0435e0db5f5fd9fc00186675f5e09df7fab..796c6cf16303f3babfe38e8033a9117c2c1926bf 100644
--- a/ui/aura/display_manager.h
+++ b/ui/aura/display_manager.h
@@ -67,7 +67,9 @@ class AURA_EXPORT DisplayManager {
   virtual RootWindow* CreateRootWindowForDisplay(
       const gfx::Display& display) = 0;
 
-  // Returns the display at |index|. The display at 0 is considered "primary".
+  // Obsoleted: Do not use in new code.
+  // Returns the display at |index|. The display at 0 is
+  // no longer considered "primary".
   virtual gfx::Display* GetDisplayAt(size_t index) = 0;
 
   virtual size_t GetNumDisplays() const = 0;
@@ -84,8 +86,8 @@ class AURA_EXPORT DisplayManager {
   virtual const gfx::Display& GetDisplayMatching(
       const gfx::Rect& match_rect) const = 0;
 
-  // Returns the human-readable name for the display specified by |index|.
-  virtual std::string GetDisplayNameAt(size_t index) = 0;
+  // Returns the human-readable name for the display specified by |display|.
+  virtual std::string GetDisplayNameFor(const gfx::Display& display) = 0;
 
  protected:
   // Calls observers' OnDisplayBoundsChanged methods.