Handle floating point coordinates from ozone to exosphere

ui/wm/core/default_screen_position_client.cc

Index: ui/wm/core/default_screen_position_client.cc
diff --git a/ui/wm/core/default_screen_position_client.cc b/ui/wm/core/default_screen_position_client.cc
index 4d7a45359d4f805a6d1172b08380e1a0757dff77..d4e5191468d7b0de0eff0f77ceda13c8ece20375 100644
--- a/ui/wm/core/default_screen_position_client.cc
+++ b/ui/wm/core/default_screen_position_client.cc
@@ -29,8 +29,16 @@ gfx::Point DefaultScreenPositionClient::GetOriginInScreen(
 void DefaultScreenPositionClient::ConvertPointToScreen(
     const aura::Window* window,
     gfx::Point* point) {
+  gfx::PointF point_f(*point);
+  ConvertPointToScreenF(window, &point_f);
+  *point = gfx::ToFlooredPoint(point_f);
+}
+
+void DefaultScreenPositionClient::ConvertPointToScreenF(
+    const aura::Window* window,
+    gfx::PointF* point) {
   const aura::Window* root_window = window->GetRootWindow();
-  aura::Window::ConvertPointToTarget(window, root_window, point);
+  aura::Window::ConvertPointToTargetF(window, root_window, point);
   gfx::Point origin = GetOriginInScreen(root_window);
   point->Offset(origin.x(), origin.y());
 }
@@ -38,10 +46,18 @@ void DefaultScreenPositionClient::ConvertPointToScreen(
 void DefaultScreenPositionClient::ConvertPointFromScreen(
     const aura::Window* window,
     gfx::Point* point) {
+  gfx::PointF point_f(*point);
+  ConvertPointFromScreenF(window, &point_f);
+  *point = gfx::ToFlooredPoint(point_f);
+}
+
+void DefaultScreenPositionClient::ConvertPointFromScreenF(
+    const aura::Window* window,
+    gfx::PointF* point) {
   const aura::Window* root_window = window->GetRootWindow();
   gfx::Point origin = GetOriginInScreen(root_window);
   point->Offset(-origin.x(), -origin.y());
-  aura::Window::ConvertPointToTarget(root_window, window, point);
+  aura::Window::ConvertPointToTargetF(root_window, window, point);
 }
 
 void DefaultScreenPositionClient::ConvertHostPointToScreen(aura::Window* window,