cros: Simple password view for lock. Adds test support.

ash/system/tray/size_range_layout.h

 // Copyright 2016 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 ASH_SYSTEM_TRAY_SIZE_RANGE_LAYOUT_H_
 #define ASH_SYSTEM_TRAY_SIZE_RANGE_LAYOUT_H_
 
 #include <memory>
 
 #include "ash/ash_export.h"
@@ skipping 27 matching lines @@
 //  container->AddChildView(label);
 //  SizeRangeLayout* layout = new SizeRangeLayout();
 //  layout->SetSize(gfx::Size(50, 50));
 //  container->SetLayoutManager(layout);
 //
 class ASH_EXPORT SizeRangeLayout : public views::LayoutManager {
  public:
   // Create a layout with no minimum or maximum preferred size.
   SizeRangeLayout();
 
+  // Create a layout using the given size set as the minimum and maximum sizes.
+  SizeRangeLayout(const gfx::Size& size);
+
   // Create a layout with the given minimum and maximum preferred sizes. If
   // |max_size| is smaller than |min_size| then |min_size| will be set to the
   // smaller |max_size| value.
   SizeRangeLayout(const gfx::Size& min_size, const gfx::Size& max_size);
 
   ~SizeRangeLayout() override;
 
   // The absolute minimum possible width/height. Use this with SetMinSize() to
   // effectively unset the minimum preferred size.
   static const int kAbsoluteMinSize;
@@ skipping 49 matching lines @@
 
   // The maximum preferred size.
   gfx::Size max_size_;
 
   DISALLOW_COPY_AND_ASSIGN(SizeRangeLayout);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_TRAY_SIZE_RANGE_LAYOUT_H_