Centralizes more shared code between ash and mash

ash/test/display_manager_test_api.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/test/display_manager_test_api.h"
 
 #include <cstdarg>
 #include <vector>
 
 #include "ash/display/display_manager.h"
@@ skipping 77 matching lines @@
       is_host_origin_set = true;
       break;
     }
   }
 
   // On non-testing environment, when a secondary display is connected, a new
   // native (i.e. X) window for the display is always created below the
   // previous one for GPU performance reasons. Try to emulate the behavior
   // unless host origins are explicitly set.
   if (!is_host_origin_set) {
-    // Sart from (1,1) so that windows won't overlap with native mouse cursor.
+    // Start from (1,1) so that windows won't overlap with native mouse cursor.
     // See |AshTestBase::SetUp()|.
     int next_y = 1;
     for (DisplayInfoList::iterator iter = display_info_list.begin();
          iter != display_info_list.end(); ++iter) {
       gfx::Rect bounds(iter->bounds_in_native().size());
       bounds.set_x(1);
       bounds.set_y(next_y);
       next_y += bounds.height();
       iter->SetBounds(bounds);
     }
@@ skipping 88 matching lines @@
   for (size_t i = 0; i < count; i++) {
     int64_t id = va_arg(args, int64_t);
     list.push_back(id);
   }
   display::SortDisplayIdList(&list);
   return list;
 }
 
 }  // namespace test
 }  // namespace ash