Handle floating point coordinates from ozone to exosphere

ui/compositor/layer.cc

Index: ui/compositor/layer.cc
diff --git a/ui/compositor/layer.cc b/ui/compositor/layer.cc
index 7d9c07b32e4f20ca9d93f3ec46617f1606449cb6..31149a880721044c885f7daedd57f4cb27150c3d 100644
--- a/ui/compositor/layer.cc
+++ b/ui/compositor/layer.cc
@@ -533,6 +533,21 @@ void Layer::ConvertPointToLayer(const Layer* source,
     target->ConvertPointFromAncestor(root_layer, point);
 }
 
+// static
+void Layer::ConvertPointToLayerF(const Layer* source,
+                                 const Layer* target,
+                                 gfx::PointF* point) {
+  if (source == target)
+    return;
+
+  const Layer* root_layer = GetRoot(source);
+  CHECK_EQ(root_layer, GetRoot(target));
+
+  if (source != root_layer)
+    source->ConvertPointForAncestorF(root_layer, point);
+  if (target != root_layer)
+    target->ConvertPointFromAncestorF(root_layer, point);
+}
 bool Layer::GetTargetTransformRelativeTo(const Layer* ancestor,
                                          gfx::Transform* transform) const {
   const Layer* p = this;
@@ -956,21 +971,37 @@ void Layer::StackRelativeTo(Layer* child, Layer* other, bool above) {
 
 bool Layer::ConvertPointForAncestor(const Layer* ancestor,
                                     gfx::Point* point) const {
+  gfx::PointF point_f(*point);
+  bool result = ConvertPointForAncestorF(ancestor, &point_f);
+  *point = gfx::ToFlooredPoint(point_f);
+  return result;
+}
+
+bool Layer::ConvertPointFromAncestor(const Layer* ancestor,
+                                     gfx::Point* point) const {
+  gfx::PointF point_f(*point);
+  bool result = ConvertPointFromAncestorF(ancestor, &point_f);
+  *point = gfx::ToFlooredPoint(point_f);
+  return result;
+}
+
+bool Layer::ConvertPointForAncestorF(const Layer* ancestor,
+                                     gfx::PointF* point) const {
   gfx::Transform transform;
   bool result = GetTargetTransformRelativeTo(ancestor, &transform);
-  auto p = gfx::Point3F(gfx::PointF(*point));
+  auto p = gfx::Point3F(*point);
   transform.TransformPoint(&p);
-  *point = gfx::ToFlooredPoint(p.AsPointF());
+  *point = p.AsPointF();
   return result;
 }
 
-bool Layer::ConvertPointFromAncestor(const Layer* ancestor,
-                                     gfx::Point* point) const {
+bool Layer::ConvertPointFromAncestorF(const Layer* ancestor,
+                                      gfx::PointF* point) const {
   gfx::Transform transform;
   bool result = GetTargetTransformRelativeTo(ancestor, &transform);
-  auto p = gfx::Point3F(gfx::PointF(*point));
+  auto p = gfx::Point3F(*point);
   transform.TransformPointReverse(&p);
-  *point = gfx::ToFlooredPoint(p.AsPointF());
+  *point = p.AsPointF();
   return result;
 }