Fix expected PlacementList sort order.

ui/display/display.h

 // 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.
 
 #ifndef UI_DISPLAY_DISPLAY_H_
 #define UI_DISPLAY_DISPLAY_H_
 
 #include <stdint.h>
 
 #include "base/compiler_specific.h"
 #include "mojo/public/cpp/bindings/struct_traits.h"
 #include "ui/display/display_export.h"
 #include "ui/display/types/display_constants.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/icc_profile.h"
 
 namespace display {
 
 namespace mojom {
 class DisplayDataView;
 }
 
+// Returns true if one of following conditions is met.
+// 1) id1 is internal.
+// 2) output index of id1 < output index of id2 and id2 isn't internal.
+DISPLAY_EXPORT bool CompareDisplayIds(int64_t id1, int64_t id2);

[afakhry, 2017/04/13 00:49:03]

This was moved from ui/display/manager/display_manager_utilities.h due to
dependency as we want to use in display_layout.

+
 // This class typically, but does not always, correspond to a physical display
 // connected to the system. A fake Display may exist on a headless system, or a
 // Display may correspond to a remote, virtual display.
 //
 // Note: The screen and display currently uses pixel coordinate
 // system. For platforms that support DIP (density independent pixel),
 // |bounds()| and |work_area| will return values in DIP coordinate
 // system, not in backing pixels.
 class DISPLAY_EXPORT Display final {
  public:
@@ skipping 170 matching lines @@
   gfx::Size maximum_cursor_size_;
   gfx::ICCProfile icc_profile_;
   int color_depth_;
   int depth_per_component_;
   bool is_monochrome_ = false;
 };
 
 }  // namespace display
 
 #endif  // UI_DISPLAY_DISPLAY_H_