Screen Magnifier: Change keyboard shortcut from [ALT + Scroll] to [CTRL + ALT + Scroll]

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 58166ead99dd13dee8f407b0d17cfee24279bf08..fd1ccf8006a7c69116c3faf1a13ccf720b67fb4d 100644
--- a/ash/magnifier/magnification_controller.cc
+++ b/ash/magnifier/magnification_controller.cc
@@ -436,7 +436,9 @@ bool MagnificationControllerImpl::PreHandleKeyEvent(aura::Window* target,
 
 bool MagnificationControllerImpl::PreHandleMouseEvent(aura::Window* target,
                                                       ui::MouseEvent* event) {
-  if (event->type() == ui::ET_SCROLL && event->IsAltDown()) {
+  if (event->type() == ui::ET_SCROLL &&
+      event->IsAltDown() &
+      event->IsControlDown()) {
     ui::ScrollEvent* scroll_event = static_cast<ui::ScrollEvent*>(event);
     float scale = GetScale();
     scale += scroll_event->y_offset() * kScrollScaleChangeFactor;