gfx: Make conversions from gfx::Point to PointF explicit.

ash/shelf/shelf_button_pressed_metric_tracker_unittest.cc

Index: ash/shelf/shelf_button_pressed_metric_tracker_unittest.cc
diff --git a/ash/shelf/shelf_button_pressed_metric_tracker_unittest.cc b/ash/shelf/shelf_button_pressed_metric_tracker_unittest.cc
index ba2f3b13a7621c2ae60add769438f51986a8180e..690049f8d4c123a12f8c7ae748f39c88e8c0de95 100644
--- a/ash/shelf/shelf_button_pressed_metric_tracker_unittest.cc
+++ b/ash/shelf/shelf_button_pressed_metric_tracker_unittest.cc
@@ -158,8 +158,8 @@ void ShelfButtonPressedMetricTrackerTest::ButtonPressed(
 // a button is pressed by a mouse event.
 TEST_F(ShelfButtonPressedMetricTrackerTest,
        Launcher_ButtonPressed_MouseIsRecordedWhenIconActivatedByMouse) {
-  const ui::MouseEvent mouse_event(ui::ET_MOUSE_PRESSED, gfx::Point(),
-                                   gfx::Point(), base::TimeDelta(), 0, 0);
+  const ui::MouseEvent mouse_event(ui::ET_MOUSE_PRESSED, gfx::PointF(),
+                                   gfx::PointF(), base::TimeDelta(), 0, 0);
 
   base::UserActionTester user_action_tester;
   ButtonPressed(mouse_event);
@@ -171,7 +171,7 @@ TEST_F(ShelfButtonPressedMetricTrackerTest,
 // a button is pressed by a touch event.
 TEST_F(ShelfButtonPressedMetricTrackerTest,
        Launcher_ButtonPressed_MouseIsRecordedWhenIconActivatedByTouch) {
-  const ui::TouchEvent touch_event(ui::ET_GESTURE_TAP, gfx::Point(), 0,
+  const ui::TouchEvent touch_event(ui::ET_GESTURE_TAP, gfx::PointF(), 0,
                                    base::TimeDelta());
 
   base::UserActionTester user_action_tester;