Add more tests for mouse rotation,scale&position after display change

ash/display/display_controller.cc

Index: ash/display/display_controller.cc
diff --git a/ash/display/display_controller.cc b/ash/display/display_controller.cc
index 7a3b6f9959daef8f7b0067eec767a425a89924be..d2cf71c8beb554e0affef234f604e47de119121a 100644
--- a/ash/display/display_controller.cc
+++ b/ash/display/display_controller.cc
@@ -536,7 +536,7 @@ void DisplayController::SetPrimaryDisplay(
   GetDisplayManager()->set_force_bounds_changed(false);
 }
 
-void DisplayController::EnsurePointerInDisplays() {
+void DisplayController::UpdateMouseLocationAfterDisplayChange() {

[pkotwicz, 2015/02/24 18:38:08]

I renamed this method because you mentioned in
https://codereview.chromium.org/902123002/ that this method should be renamed. I
did not want to rename this method and the unittests in a follow up CL

   // If the mouse is currently on a display in native location,
   // use the same native location. Otherwise find the display closest
   // to the current cursor location in screen coordinates.
@@ -751,7 +751,7 @@ void DisplayController::PostDisplayConfigurationChange() {
   }
   FOR_EACH_OBSERVER(Observer, observers_, OnDisplayConfigurationChanged());
   UpdateHostWindowNames();
-  EnsurePointerInDisplays();
+  UpdateMouseLocationAfterDisplayChange();
 }
 
 AshWindowTreeHost* DisplayController::AddWindowTreeHostForDisplay(