Primary display change notifications.

services/ui/ws/user_display_manager.h

Index: services/ui/ws/user_display_manager.h
diff --git a/services/ui/ws/user_display_manager.h b/services/ui/ws/user_display_manager.h
index 82834f39bc6253a93d1659cb68d617fb007d8b4f..e5326b764476c237754247f803656797ab4d1b2a 100644
--- a/services/ui/ws/user_display_manager.h
+++ b/services/ui/ws/user_display_manager.h
@@ -11,7 +11,7 @@
 #include "base/macros.h"
 #include "mojo/public/cpp/bindings/binding_set.h"
 #include "mojo/public/cpp/bindings/interface_ptr_set.h"
-#include "services/ui/public/interfaces/display.mojom.h"
+#include "services/ui/public/interfaces/display_manager.mojom.h"
 #include "services/ui/ws/user_id.h"
 
 namespace gfx {
@@ -43,16 +43,19 @@ class UserDisplayManager : public mojom::DisplayManager {
   void AddDisplayManagerBinding(
       mojo::InterfaceRequest<mojom::DisplayManager> request);
 
+  // Called when something about the display (e.g. pixel-ratio, size) changes.
+  void OnDisplayUpdate(Display* display);
+
   // Called by Display prior to |display| being removed and destroyed.
   void OnWillDestroyDisplay(Display* display);
 
+  // Called when the primary display changes.
+  void OnPrimaryDisplayChanged(int64_t primary_display_id);
+
   // Called from WindowManagerState when its EventDispatcher receives a mouse
   // event.
   void OnMouseCursorLocationChanged(const gfx::Point& point);
 
-  // Called when something about the display (e.g. pixel-ratio, size) changes.
-  void OnDisplayUpdate(Display* display);
-
   // Returns a read-only handle to the shared memory which contains the global
   // mouse cursor position. Each call returns a new handle.
   mojo::ScopedSharedBufferHandle GetCursorLocationMemory();
@@ -64,6 +67,9 @@ class UserDisplayManager : public mojom::DisplayManager {
   // notifies the observer immediately.
   void OnObserverAdded(mojom::DisplayManagerObserver* observer);
 
+  // Fills in a WsDisplayPtr for |display|.
+  mojom::WsDisplayPtr GetWsDisplayPtr(const Display& display);
+
   mojo::Array<mojom::WsDisplayPtr> GetAllDisplays();
 
   // Calls OnDisplays() on |observer|.