Add device policy: Kiosk Virtual Keyboard Layout.

ui/keyboard/keyboard_util.h

Index: ui/keyboard/keyboard_util.h
diff --git a/ui/keyboard/keyboard_util.h b/ui/keyboard/keyboard_util.h
index d553c1b4f7272bf6c27499f252921e6666d8a38f..b4e950aa9596ee7b6212d40703777046f99263fb 100644
--- a/ui/keyboard/keyboard_util.h
+++ b/ui/keyboard/keyboard_util.h
@@ -45,6 +45,13 @@ enum KeyboardOverscrolOverride {
   KEYBOARD_OVERSCROLL_OVERRIDE_NONE,
 };
 
+// An enumeration of keyboard policy settings.
+enum KeyboardShowOverride {
+  KEYBOARD_SHOW_OVERRIDE_DISABLED = 0,
+  KEYBOARD_SHOW_OVERRIDE_ENABLED = 1,

[bartfab (slow), 2014/06/16 10:20:13]

Nit 1: Why explicitly set the value of this constant to 1? C will automatically
increment by 1 for each constant in an enum.

Nit 2: Should this be in an #ifdef? It is not used on any platforms other than
Chrome OS after all.

[rsadam, 2014/06/16 13:45:35]

 Done. 
All of keyboard_util is CHROMEOS only in the sense that the keyboard is only
ever created on CHROMEOS.

+  KEYBOARD_SHOW_OVERRIDE_NONE,
+};
+
 // Gets the default keyboard bounds from |window_bounds|.
 KEYBOARD_EXPORT gfx::Rect DefaultKeyboardBoundsFromWindowBounds(
     const gfx::Rect& window_bounds);
@@ -82,6 +89,9 @@ KEYBOARD_EXPORT bool IsKeyboardOverscrollEnabled();
 KEYBOARD_EXPORT void SetKeyboardOverscrollOverride(
     KeyboardOverscrolOverride override);
 
+// Sets policy override on whether to show the keyboard.

[bartfab (slow), 2014/06/16 10:20:13]

I see that this is consistent with the rest of the file but I am stil surprised
to see "keyboard" used everywhere. Would "virtual keyboard" not have been the
better term?

[rsadam, 2014/06/16 13:45:35]

I'm not sure why one was chosen over the other - this file predates me joining
the team. I'll ask my TL about it - perhaps it makes sense to have a follow up
CL to refactor this file.

+KEYBOARD_EXPORT void SetKeyboardShowOverride(KeyboardShowOverride override);

[bartfab (slow), 2014/06/16 10:20:13]

Nit: Should this be in an #ifdef? It is not used on any platforms other than
Chrome OS after all.

[rsadam, 2014/06/16 13:45:35]

The keyboard is only instantiated in chromeos so this might not be necessary.

+
 // Returns true if an IME extension can specify a custom input view for the
 // virtual keyboard window.
 KEYBOARD_EXPORT bool IsInputViewEnabled();