Use root window's coordinates when updating cursor in Aura

ui/aura/test/test_cursor_client.cc

Index: ui/aura/test/test_cursor_client.cc
diff --git a/ui/aura/test/test_cursor_client.cc b/ui/aura/test/test_cursor_client.cc
index 6c6dc41f9645d14baaa1c3141a7c591adcdf2e40..f0411ef04b86cdd76af4e0251f62c11fce7ccbc0 100644
--- a/ui/aura/test/test_cursor_client.cc
+++ b/ui/aura/test/test_cursor_client.cc
@@ -13,6 +13,7 @@ TestCursorClient::TestCursorClient(aura::Window* root_window)
     : visible_(true),
       mouse_events_enabled_(true),
       cursor_lock_count_(0),
+      calls_to_set_cursor_(0),
       root_window_(root_window) {
   client::SetCursorClient(root_window, this);
 }
@@ -22,6 +23,7 @@ TestCursorClient::~TestCursorClient() {
 }
 
 void TestCursorClient::SetCursor(gfx::NativeCursor cursor) {
+  calls_to_set_cursor_++;
 }
 
 gfx::NativeCursor TestCursorClient::GetCursor() const {