[WIP][Ozone] Support external touchscreens

ui/ozone/platform/dri/ozone_platform_dri.cc

Index: ui/ozone/platform/dri/ozone_platform_dri.cc
diff --git a/ui/ozone/platform/dri/ozone_platform_dri.cc b/ui/ozone/platform/dri/ozone_platform_dri.cc
index 63750e274b857950671a098d740aeac93188caeb..a608e634f5bdb0707cdb8acc501c5739cfbfcd50 100644
--- a/ui/ozone/platform/dri/ozone_platform_dri.cc
+++ b/ui/ozone/platform/dri/ozone_platform_dri.cc
@@ -9,6 +9,7 @@
 #include "ui/events/ozone/device/device_manager.h"
 #include "ui/events/ozone/evdev/cursor_delegate_evdev.h"
 #include "ui/events/ozone/evdev/event_factory_evdev.h"
+#include "ui/ozone/platform/dri/display_manager.h"
 #include "ui/ozone/platform/dri/dri_buffer.h"
 #include "ui/ozone/platform/dri/dri_cursor.h"
 #include "ui/ozone/platform/dri/dri_gpu_platform_support.h"
@@ -70,7 +71,8 @@ class OzonePlatformDri : 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();
   }
@@ -81,6 +83,7 @@ class OzonePlatformDri : public OzonePlatform {
   }
   virtual void InitializeUI() override {
     dri_->Initialize();
+    display_manager_.reset(new DisplayManager());
     surface_factory_ozone_.reset(new DriSurfaceFactory(
         dri_.get(), screen_manager_.get(), &window_delegate_manager_));
     gpu_platform_support_.reset(
@@ -115,6 +118,7 @@ class OzonePlatformDri : public OzonePlatform {
   scoped_ptr<EventFactoryEvdev> event_factory_ozone_;
 
   scoped_ptr<DriWindowManager> window_manager_;
+  scoped_ptr<DisplayManager> display_manager_;
 
   scoped_ptr<DriGpuPlatformSupport> gpu_platform_support_;
   scoped_ptr<DriGpuPlatformSupportHost> gpu_platform_support_host_;