[ash-md] Adjusts layout of lists with sticky header rows to match specs

ash/common/system/tray/tray_popup_utils.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_COMMON_SYSTEM_TRAY_TRAY_POPUP_UTILS_H_
 #define ASH_COMMON_SYSTEM_TRAY_TRAY_POPUP_UTILS_H_
 
 #include "ash/common/login_status.h"
 #include "ash/common/system/tray/tray_constants.h"
 #include "ash/common/system/tray/tray_popup_ink_drop_style.h"
@@ skipping 28 matching lines @@
   // The returned view consists of 3 regions: START, CENTER, and END. Any child
   // Views added to the START and END containers will be added horizontally and
   // any Views added to the CENTER container will be added vertically.
   //
   // The START and END containers have a fixed minimum width but can grow into
   // the CENTER container if space is required and available.
   //
   // The CENTER container has a flexible width.
   static TriView* CreateDefaultRowView();
 
+  // Creates a container view to be used by system menu sub-section header rows.
+  // The caller takes over ownership of the created view.
+  //
+  // The returned view consists of 2 regions: CENTER, and END having the same
+  // properties as when using |CreateMultiTargetRowView|. The START container is
+  // hidden.
+  // The END container has a fixed minimum width but can grow into the CENTER
+  // container if space is required and available. The CENTER container has a
+  // flexible width.
+  static TriView* CreateSubHeaderRowView();
+
   // Creates a container view to be used by system menu rows that want to embed
   // a targetable area within one (or more) of the containers OR by any row
   // that requires a non-default layout within the container views. The returned
   // view will have the following configurations:
   //   - default minimum row height
   //   - default minimum width for the START and END containers
   //   - default left and right insets
   //   - default container flex values
   //   - Each container view will have a FillLayout installed on it
   //
@@ skipping 103 matching lines @@
   static std::unique_ptr<views::InkDropMask> CreateInkDropMask(
       TrayPopupInkDropStyle ink_drop_style,
       const views::View* host);
 
   // Creates and returns a horizontal separator line to be drawn between rows
   // in a detailed view. If |left_inset| is true, then the separator is inset on
   // the left by the width normally occupied by an icon. Caller assumes
   // ownership of the returned separator.
   static views::Separator* CreateListItemSeparator(bool left_inset);
 
+  // Creates and returns a horizontal separator line to be drawn between rows
+  // in a detailed view above the sub-header rows. Caller assumes ownership of
+  // the returned separator.
+  static views::Separator* CreateListSubHeaderSeparator();
+
   // Returns true if it is possible to open WebUI settings in a browser window,
   // i.e., the user is logged in, not on the lock screen, and not in a secondary
   // account flow.
   static bool CanOpenWebUISettings(LoginStatus status);
 
  private:
   // Returns the effective ink drop insets for |host| according to the
   // |ink_drop_style|.
   static gfx::Insets GetInkDropInsets(TrayPopupInkDropStyle ink_drop_style);
 
   // Returns the effective ink drop bounds for |host| according to the
   // |ink_drop_style|.
   static gfx::Rect GetInkDropBounds(TrayPopupInkDropStyle ink_drop_style,
                                     const views::View* host);
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(TrayPopupUtils);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_SYSTEM_TRAY_TRAY_POPUP_UTILS_H_