[WIP][Ozone] Support external touchscreens

ui/ozone/platform/dri/dri_window.h

Index: ui/ozone/platform/dri/dri_window.h
diff --git a/ui/ozone/platform/dri/dri_window.h b/ui/ozone/platform/dri/dri_window.h
index 9197ce0c62f56f7bb725df70c98769790215ffe1..ba7b625aa565eb1675186eb3220951241b57efa7 100644
--- a/ui/ozone/platform/dri/dri_window.h
+++ b/ui/ozone/platform/dri/dri_window.h
@@ -10,10 +10,12 @@
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/ozone/platform/dri/channel_observer.h"
+#include "ui/ozone/platform/dri/touch_converter.h"
 #include "ui/platform_window/platform_window.h"
 
 namespace ui {
 
+class DisplayManager;
 class DriWindowDelegate;
 class DriWindowManager;
 class EventFactoryEvdev;
@@ -27,7 +29,8 @@ class DriWindow : public PlatformWindow,
             const gfx::Rect& bounds,
             DriGpuPlatformSupportHost* sender,
             EventFactoryEvdev* event_factory,
-            DriWindowManager* window_manager);
+            DriWindowManager* window_manager,
+            DisplayManager* display_manager);
   virtual ~DriWindow();
 
   void Initialize();
@@ -64,6 +67,9 @@ class DriWindow : public PlatformWindow,
   gfx::Rect bounds_;
   gfx::AcceleratedWidget widget_;
 
+  // Transforms touch events into the window coordinate system.
+  TouchConverter touch_converter_;
+
   DISALLOW_COPY_AND_ASSIGN(DriWindow);
 };