Aura: Add Window::MoveCursorTo() taking relative location to the window.

ui/aura/root_window.cc

Index: ui/aura/root_window.cc
diff --git a/ui/aura/root_window.cc b/ui/aura/root_window.cc
index 6c6d6bbde2f806dbba328489cb7595712220fa55..a739fc90e2cce61354202e09db5a107909af230b 100644
--- a/ui/aura/root_window.cc
+++ b/ui/aura/root_window.cc
@@ -217,7 +217,10 @@ void RootWindow::ShowCursor(bool show) {
 }
 
 void RootWindow::MoveCursorTo(const gfx::Point& location_in_dip) {
-  host_->MoveCursorTo(ui::ConvertPointToPixel(layer(), location_in_dip));
+  gfx::Point location = location_in_dip;
+  layer()->transform().TransformPoint(location);
+  host_->MoveCursorTo(ui::ConvertPointToPixel(layer(), location));
+  last_mouse_location_ = location_in_dip;
 }
 
 bool RootWindow::ConfineCursorToWindow() {