[WIP][Ozone] Support external touchscreens

ui/ozone/platform/dri/native_display_delegate_proxy.h

Index: ui/ozone/platform/dri/native_display_delegate_proxy.h
diff --git a/ui/ozone/platform/dri/native_display_delegate_proxy.h b/ui/ozone/platform/dri/native_display_delegate_proxy.h
index 2dcf0e1723dd3195ce158af69d2ac2441d3110d0..31367542ac5656604d5502d5b48c3f678f2479c4 100644
--- a/ui/ozone/platform/dri/native_display_delegate_proxy.h
+++ b/ui/ozone/platform/dri/native_display_delegate_proxy.h
@@ -15,6 +15,7 @@
 namespace ui {
 
 class DeviceManager;
+class DisplayManager;
 class DriGpuPlatformSupportHost;
 
 struct DisplaySnapshot_Params;
@@ -24,7 +25,8 @@ class NativeDisplayDelegateProxy : public NativeDisplayDelegate,
                                    public GpuPlatformSupportHost {
  public:
   NativeDisplayDelegateProxy(DriGpuPlatformSupportHost* proxy,
-                             DeviceManager* device_manager);
+                             DeviceManager* device_manager,
+                             DisplayManager* display_manager);
   virtual ~NativeDisplayDelegateProxy();
 
   // NativeDisplayDelegate overrides:
@@ -70,6 +72,8 @@ class NativeDisplayDelegateProxy : public NativeDisplayDelegate,
 
   DriGpuPlatformSupportHost* proxy_;  // Not owned.
   DeviceManager* device_manager_;     // Not owned.
+  DisplayManager* display_manager_;   // Not owned.
+
   ScopedVector<DisplaySnapshot> displays_;
   ObserverList<NativeDisplayObserver> observers_;