[WIP][Ozone] Support external touchscreens

ui/ozone/platform/dri/ozone_platform_gbm.cc

Index: ui/ozone/platform/dri/ozone_platform_gbm.cc
diff --git a/ui/ozone/platform/dri/ozone_platform_gbm.cc b/ui/ozone/platform/dri/ozone_platform_gbm.cc
index 344422ba9e55fa0103fa569d8127ea1180857481..fc784aff5e04cfe6ea5db88949222fa5a533e884 100644
--- a/ui/ozone/platform/dri/ozone_platform_gbm.cc
+++ b/ui/ozone/platform/dri/ozone_platform_gbm.cc
@@ -13,6 +13,7 @@
 #include "ui/base/cursor/ozone/bitmap_cursor_factory_ozone.h"
 #include "ui/events/ozone/device/device_manager.h"
 #include "ui/events/ozone/evdev/event_factory_evdev.h"
+#include "ui/ozone/platform/dri/display_manager.h"
 #include "ui/ozone/platform/dri/dri_cursor.h"
 #include "ui/ozone/platform/dri/dri_gpu_platform_support.h"
 #include "ui/ozone/platform/dri/dri_gpu_platform_support_host.h"
@@ -102,17 +103,21 @@ class OzonePlatformGbm : public OzonePlatform {
                       bounds,
                       gpu_platform_support_host_.get(),
                       event_factory_ozone_.get(),
-                      window_manager_.get()));
+                      window_manager_.get(),
+                      display_manager_.get()));
     platform_window->Initialize();
     return platform_window.Pass();
   }
   virtual scoped_ptr<NativeDisplayDelegate> CreateNativeDisplayDelegate()
       override {
-    return scoped_ptr<NativeDisplayDelegate>(new NativeDisplayDelegateProxy(
-        gpu_platform_support_host_.get(), device_manager_.get()));
+    return scoped_ptr<NativeDisplayDelegate>(
+        new NativeDisplayDelegateProxy(gpu_platform_support_host_.get(),
+                                       device_manager_.get(),
+                                       display_manager_.get()));
   }
   virtual void InitializeUI() override {
     vt_manager_.reset(new VirtualTerminalManager());
+    display_manager_.reset(new DisplayManager());
     // Needed since the browser process creates the accelerated widgets and that
     // happens through SFO.
     surface_factory_ozone_.reset(new GbmSurfaceFactory(use_surfaceless_));
@@ -169,6 +174,8 @@ class OzonePlatformGbm : public OzonePlatform {
   // Browser side object only.
   scoped_ptr<DriWindowManager> window_manager_;
 
+  scoped_ptr<DisplayManager> display_manager_;
+
   DISALLOW_COPY_AND_ASSIGN(OzonePlatformGbm);
 };