exo: Fix cursor scaling for 1.25 DSF

ui/display/manager/managed_display_info.cc

Index: ui/display/manager/managed_display_info.cc
diff --git a/ui/display/manager/managed_display_info.cc b/ui/display/manager/managed_display_info.cc
index c1fc55471ddf35ec455e6201824b5e1e0405cf52..02c329635a6fa470092e52d263bfaaf534ad3f2c 100644
--- a/ui/display/manager/managed_display_info.cc
+++ b/ui/display/manager/managed_display_info.cc
@@ -393,6 +393,12 @@ void ManagedDisplayInfo::SetBounds(const gfx::Rect& new_bounds_in_native) {
   UpdateDisplaySize();
 }
 
+float ManagedDisplayInfo::GetDensityRatio() const {
+  if (Use125DSFForUIScaling() && device_scale_factor_ == 1.25f)
+    return 1.0f;
+  return device_scale_factor_;
+}
+
 float ManagedDisplayInfo::GetEffectiveDeviceScaleFactor() const {
   if (Use125DSFForUIScaling() && device_scale_factor_ == 1.25f)
     return (configured_ui_scale_ == 0.8f) ? 1.25f : 1.0f;
@@ -504,7 +510,7 @@ bool ManagedDisplayInfo::IsColorProfileAvailable(
 }
 
 bool ManagedDisplayInfo::Use125DSFForUIScaling() const {
-  return Display::IsInternalDisplayId(id_);
+  return id_ != kInvalidDisplayId && Display::IsInternalDisplayId(id_);

[oshima, 2017/06/23 23:57:14]

why this is necessary?

[Dominik Laskowski, 2017/06/23 23:59:13]

So GetDensityRatio does not DCHECK on a default-constructed ManagedDisplayInfo.

 }
 
 void ManagedDisplayInfo::AddInputDevice(int id) {