[WIP][Ozone] Support external touchscreens

ui/ozone/platform/dri/dri_window.cc

Index: ui/ozone/platform/dri/dri_window.cc
diff --git a/ui/ozone/platform/dri/dri_window.cc b/ui/ozone/platform/dri/dri_window.cc
index cce1dd63de19aafb2bebb63379dcef613ce4faf5..4d5a614104f889fc221bdb4b2488a00944b79849 100644
--- a/ui/ozone/platform/dri/dri_window.cc
+++ b/ui/ozone/platform/dri/dri_window.cc
@@ -21,13 +21,15 @@ DriWindow::DriWindow(PlatformWindowDelegate* delegate,
                      const gfx::Rect& bounds,
                      DriGpuPlatformSupportHost* sender,
                      EventFactoryEvdev* event_factory,
-                     DriWindowManager* window_manager)
+                     DriWindowManager* window_manager,
+                     DisplayManager* display_manager)
     : delegate_(delegate),
       sender_(sender),
       event_factory_(event_factory),
       window_manager_(window_manager),
       bounds_(bounds),
-      widget_(window_manager->NextAcceleratedWidget()) {
+      widget_(window_manager->NextAcceleratedWidget()),
+      touch_converter_(this, display_manager) {
   window_manager_->AddWindow(widget_, this);
 }
 
@@ -57,6 +59,7 @@ void DriWindow::Close() {}
 void DriWindow::SetBounds(const gfx::Rect& bounds) {
   bounds_ = bounds;
   delegate_->OnBoundsChanged(bounds);
+  touch_converter_.UpdateTransform();
 
   if (!sender_->IsConnected())
     return;
@@ -100,10 +103,18 @@ bool DriWindow::CanDispatchEvent(const PlatformEvent& ne) {
   if (event->IsMouseEvent() || event->IsScrollEvent())
     return window_manager_->cursor()->GetCursorWindow() == widget_;
 
+  if (event->IsTouchEvent())
+    return touch_converter_.CanHandleEvent(*static_cast<TouchEvent*>(event));
+
   return true;
 }
 
 uint32_t DriWindow::DispatchEvent(const PlatformEvent& native_event) {
+  DCHECK(native_event);
+  Event* event = static_cast<Event*>(native_event);
+  if (event->IsTouchEvent())
+    touch_converter_.RewriteTouchEvent(static_cast<TouchEvent*>(event));
+
   DispatchEventFromNativeUiEvent(
       native_event,
       base::Bind(&PlatformWindowDelegate::DispatchEvent,