ash: Make sure all the sub-popups retain the same height as the main popup.

ash/system/tray/tray_details_view.h

Index: ash/system/tray/tray_details_view.h
diff --git a/ash/system/tray/tray_details_view.h b/ash/system/tray/tray_details_view.h
new file mode 100644
index 0000000000000000000000000000000000000000..add338f8b34f982293356d946816bb3224578404
--- /dev/null
+++ b/ash/system/tray/tray_details_view.h
@@ -0,0 +1,55 @@
+// 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 ASH_SYSTEM_TRAY_TRAY_DETAILS_VIEW_H_
+#define ASH_SYSTEM_TRAY_TRAY_DETAILS_VIEW_H_
+
+#include "ui/views/view.h"
+
+namespace views {
+class ScrollView;
+}
+
+namespace ash {
+namespace internal {
+
+class FixedSizedScrollView;
+class SpecialPopupRow;
+class ViewClickListener;
+
+class TrayDetailsView : public views::View {
+ public:
+  TrayDetailsView();
+  virtual ~TrayDetailsView();
+
+  // Creates a row with special highlighting etc. This is typically the
+  // bottom-most row in the popup.
+  void CreateSpecialRow(int string_id, ViewClickListener* listener);
+
+  // Creates a scrollable list.
+  void CreateScrollableList();
+
+  // Removes (and destroys) all child views.
+  void Reset();
+
+  SpecialPopupRow* footer() const { return footer_; }
+  FixedSizedScrollView* scroller() const { return scroller_; }
+  views::View* scroll_content() const { return scroll_content_; }
+
+ protected:
+  // Overridden from views::View.
+  virtual void Layout() OVERRIDE;
+
+ private:
+  SpecialPopupRow* footer_;
+  FixedSizedScrollView* scroller_;
+  views::View* scroll_content_;
+
+  DISALLOW_COPY_AND_ASSIGN(TrayDetailsView);
+};
+
+}  // namespace internal
+}  // namespace ash
+
+#endif  // ASH_SYSTEM_TRAY_TRAY_DETAILS_VIEW_H_