Magnifier: Prevent the cursor jumping on HiDPI display.

ash/magnifier/magnification_controller.cc

Index: ash/magnifier/magnification_controller.cc
diff --git a/ash/magnifier/magnification_controller.cc b/ash/magnifier/magnification_controller.cc
index 21cb63b9bd0faab7ecbf15180a1779f53dda5221..c68147d24c4576e6023c6dbf12ff2b45f91eafb1 100644
--- a/ash/magnifier/magnification_controller.cc
+++ b/ash/magnifier/magnification_controller.cc
@@ -43,9 +43,9 @@ const float kScrollScaleChangeFactor = 0.05f;
 const int kPanningMergin = 100;
 
 void MoveCursorTo(aura::RootWindow* root_window,
-                  const gfx::Point root_location) {
+                  const gfx::Point& root_location) {
   gfx::Point3F host_location_3f(root_location);
-  root_window->layer()->transform().TransformPoint(host_location_3f);
+  root_window->GetRootTransform().TransformPoint(host_location_3f);
   root_window->MoveCursorToHostLoation(
       gfx::ToCeiledPoint(host_location_3f.AsPointF()));

[oshima, 2013/04/30 23:03:07]

We have this rounding issue because we're converting the coordinate
back and force. For m29, I'd like to change our cursor control
code so that it controls in host coordinates and convert to Root only
when necessary (say making decision).

 }