Add a11y virtual keyboard icon when a11y VK is enabled

ash/system/tray/tray_background_view.h

Index: ash/system/tray/tray_background_view.h
diff --git a/ash/system/tray/tray_background_view.h b/ash/system/tray/tray_background_view.h
index 4addcba51294e1f05e0b7945d73173ea9b856ad6..cd592d33fd031c365538f3211ed283127262ecd9 100644
--- a/ash/system/tray/tray_background_view.h
+++ b/ash/system/tray/tray_background_view.h
@@ -38,8 +38,6 @@ class ASH_EXPORT TrayBackgroundView : public ActionableView,
 
     void SetAlignment(ShelfAlignment alignment);
 
-    void set_size(const gfx::Size& size) { size_ = size; }

[kevers, 2014/03/03 16:58:45]

Is this change intentional?  If this is dead code, it should probably be moved
to a separate CL as it is not specific to the a11y keyboard.

[bshe, 2014/03/03 20:24:03]

Done.

-
     // Overridden from views::View.
     virtual gfx::Size GetPreferredSize() OVERRIDE;