Handle floating point coordinates from ozone to exosphere

ash/display/screen_position_controller.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/display/screen_position_controller.h"
 
 #include "ash/common/wm/window_positioning_utils.h"
 #include "ash/common/wm/window_state.h"
 #include "ash/common/wm_shell.h"
 #include "ash/common/wm_window.h"
@@ skipping 57 matching lines @@
       }
     }
   }
 #endif
   *target_root = root_window;
   *point = point_in_root;
 }
 
 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))
           .bounds()
           .origin();
   point->Offset(display_origin.x(), display_origin.y());
 }
 
 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()
           ->GetDisplayNearestWindow(const_cast<aura::Window*>(root))
           .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(
     aura::Window* root_window,
     gfx::Point* point) {
   aura::Window* root = root_window->GetRootWindow();
   aura::Window* target_root = nullptr;
   ConvertHostPointToRelativeToRootWindow(
       root, WmWindow::ToAuraWindows(WmShell::Get()->GetAllRootWindows()), point,
       &target_root);
   ConvertPointToScreen(target_root, point);
 }
 
 void ScreenPositionController::SetBounds(aura::Window* window,
                                          const gfx::Rect& bounds,
                                          const display::Display& display) {
   if (!window->parent()->GetProperty(kUsesScreenCoordinatesKey)) {
     window->SetBounds(bounds);
     return;
   }
 
   wm::SetBoundsInScreen(WmWindow::Get(window), bounds, display);
 }
 
 }  // namespace ash