Fix event dispatching offset problem in the client-lib in high-dpi mode. (conversion)

ui/aura/mus/window_tree_client.cc

Index: ui/aura/mus/window_tree_client.cc
diff --git a/ui/aura/mus/window_tree_client.cc b/ui/aura/mus/window_tree_client.cc
index b71391bc5bab8f5977235c55f7e570fe3f791b1c..42930fceb4ec2f075027591ad23854d43628badd 100644
--- a/ui/aura/mus/window_tree_client.cc
+++ b/ui/aura/mus/window_tree_client.cc
@@ -42,6 +42,7 @@
 #include "ui/aura/mus/window_tree_host_mus.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_delegate.h"
+#include "ui/aura/window_event_dispatcher.h"
 #include "ui/aura/window_tracker.h"
 #include "ui/base/ui_base_types.h"
 #include "ui/display/display.h"
@@ -1152,10 +1153,13 @@ void WindowTreeClient::OnWindowInputEvent(uint32_t event_id,
   // The location of the event is relative to |window|. As the event is handed
   // to WindowTreeHost we need it to be relative to WindowTreeHost.
   if (event->IsLocatedEvent()) {
-    gfx::Point host_location = event->AsLocatedEvent()->location();
+    gfx::Point host_location_in_pixels = event->AsLocatedEvent()->location();
+    gfx::Point host_location_in_dip = gfx::ConvertPointToDIP(
+        ScaleFactorForDisplay(window->GetWindow()), host_location_in_pixels);
     aura::Window::ConvertPointToTarget(window->GetWindow(), host->window(),
-                                       &host_location);
-    event->AsLocatedEvent()->set_location(host_location);
+                                       &host_location_in_dip);
+    event->AsLocatedEvent()->set_location(host_location_in_dip);
+    window->GetWindow()->GetHost()->dispatcher()->set_transform_events(false);
   }
 
   EventAckHandler ack_handler(CreateEventResultCallback(event_id));