Show ChromeVox caption panel when spoken feedback is enabled.

ash/shelf/shelf_layout_manager.h

 // Copyright 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_SHELF_SHELF_LAYOUT_MANAGER_H_
 #define ASH_SHELF_SHELF_LAYOUT_MANAGER_H_
 
 #include <vector>
 
 #include "ash/ash_export.h"
@@ skipping 197 matching lines @@
   }
 
   template<typename T>
   T PrimaryAxisValue(T horizontal, T vertical) const {
     return IsHorizontalAlignment() ? horizontal : vertical;
   }
 
   // Is the shelf's alignment horizontal?
   bool IsHorizontalAlignment() const;
 
+  // Set the height of the ChromeVox panel, which takes away space from the
+  // available work area from the top of the screen.
+  void SetChromeVoxPanelHeight(int height);
+
   // Returns a ShelfLayoutManager on the display which has a shelf for
   // given |window|. See RootWindowController::ForShelf for more info.
   static ShelfLayoutManager* ForShelf(aura::Window* window);
 
  private:
   class AutoHideEventFilter;
   class UpdateShelfObserver;
   friend class AshPopupAlignmentDelegateTest;
   friend class ash::ScreenAsh;
   friend class PanelLayoutManagerTest;
@@ skipping 177 matching lines @@
   // The bounds of the keyboard.
   gfx::Rect keyboard_bounds_;
 
   // The bounds of the dock.
   gfx::Rect dock_bounds_;
 
   // The bounds within the root window not occupied by the shelf nor the virtual
   // keyboard.
   gfx::Rect user_work_area_bounds_;
 
+  // The height of the ChromeVox panel at the top of the screen, which
+  // needs to be removed from the available work area.
+  int chromevox_panel_height_;
+
   // The show hide animation duration override or 0 for default.
   int duration_override_in_ms_;
 
   DISALLOW_COPY_AND_ASSIGN(ShelfLayoutManager);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELF_SHELF_LAYOUT_MANAGER_H_