Handle floating point coordinates from ozone to exosphere

ash/display/screen_position_controller.cc

Index: ash/display/screen_position_controller.cc
diff --git a/ash/display/screen_position_controller.cc b/ash/display/screen_position_controller.cc
index 6481c0f78055e0200b622385f730735f39019e71..45f8a3f6e269347368b3a2ae2f3cb3ab6b2a7d88 100644
--- a/ash/display/screen_position_controller.cc
+++ b/ash/display/screen_position_controller.cc
@@ -75,8 +75,15 @@ void ScreenPositionController::ConvertHostPointToRelativeToRootWindow(
 
 void ScreenPositionController::ConvertPointToScreen(const aura::Window* window,
                                                     gfx::Point* point) {
+  gfx::PointF point_f(*point);
+  ConvertPointToScreenF(window, &point_f);
+  *point = gfx::ToFlooredPoint(point_f);
+}
+
+void ScreenPositionController::ConvertPointToScreenF(const aura::Window* window,
+                                                     gfx::PointF* point) {
   const aura::Window* root = window->GetRootWindow();
-  aura::Window::ConvertPointToTarget(window, root, point);
+  aura::Window::ConvertPointToTargetF(window, root, point);
   const gfx::Point display_origin =
       display::Screen::GetScreen()
           ->GetDisplayNearestWindow(const_cast<aura::Window*>(root))
@@ -88,6 +95,14 @@ void ScreenPositionController::ConvertPointToScreen(const aura::Window* window,
 void ScreenPositionController::ConvertPointFromScreen(
     const aura::Window* window,
     gfx::Point* point) {
+  gfx::PointF point_f(*point);
+  ConvertPointFromScreenF(window, &point_f);
+  *point = gfx::ToFlooredPoint(point_f);
+}
+
+void ScreenPositionController::ConvertPointFromScreenF(
+    const aura::Window* window,
+    gfx::PointF* point) {
   const aura::Window* root = window->GetRootWindow();
   const gfx::Point display_origin =
       display::Screen::GetScreen()
@@ -95,7 +110,7 @@ void ScreenPositionController::ConvertPointFromScreen(
           .bounds()
           .origin();
   point->Offset(-display_origin.x(), -display_origin.y());
-  aura::Window::ConvertPointToTarget(root, window, point);
+  aura::Window::ConvertPointToTargetF(root, window, point);
 }
 
 void ScreenPositionController::ConvertHostPointToScreen(