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

ash/display/display_controller.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/display/display_controller.h"
 
 #include <algorithm>
 #include <cmath>
 #include <map>
 
@@ skipping 518 matching lines @@
   std::vector<DisplayInfo> display_info_list;
   display_info_list.push_back(display_manager->GetDisplayInfo(
       primary_display_id));
   display_info_list.push_back(display_manager->GetDisplayInfo(
       ScreenUtil::GetSecondaryDisplay().id()));
   GetDisplayManager()->set_force_bounds_changed(true);
   GetDisplayManager()->UpdateDisplays(display_info_list);
   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.
 
   gfx::Point point_in_screen = Shell::GetScreen()->GetCursorScreenPoint();
   gfx::Point target_location_in_native;
   int64 closest_distance_squared = -1;
   DisplayManager* display_manager = GetDisplayManager();
 
   aura::Window* dst_root_window = NULL;
@@ skipping 194 matching lines @@
       // Update the primary_id in case the above call is
       // ignored. Happens when a) default layout's primary id
       // doesn't exist, or b) the primary_id has already been
       // set to the same and didn't update it.
       layout_store->UpdatePrimaryDisplayId(
           pair, Shell::GetScreen()->GetPrimaryDisplay().id());
     }
   }
   FOR_EACH_OBSERVER(Observer, observers_, OnDisplayConfigurationChanged());
   UpdateHostWindowNames();
-  EnsurePointerInDisplays();
+  UpdateMouseLocationAfterDisplayChange();
 }
 
 AshWindowTreeHost* DisplayController::AddWindowTreeHostForDisplay(
     const gfx::Display& display,
     const AshWindowTreeHostInitParams& init_params) {
   static int host_count = 0;
   const DisplayInfo& display_info =
       GetDisplayManager()->GetDisplayInfo(display.id());
   AshWindowTreeHostInitParams params_with_bounds(init_params);
   params_with_bounds.initial_bounds = display_info.bounds_in_native();
@@ skipping 45 matching lines @@
     std::string name =
         root_windows[i] == primary ? "aura_root_0" : "aura_root_x";
     gfx::AcceleratedWidget xwindow =
         root_windows[i]->GetHost()->GetAcceleratedWidget();
     XStoreName(gfx::GetXDisplay(), xwindow, name.c_str());
   }
 #endif
 }
 
 }  // namespace ash