Support comma separated hardware keyboard layout.

chromeos/ime/input_method_delegate.h

Index: chromeos/ime/input_method_delegate.h
diff --git a/chromeos/ime/input_method_delegate.h b/chromeos/ime/input_method_delegate.h
index b732c48c5bb844d2dc0702015436f57365f23f6c..2f15272eaede4951c1a32058d7c10ed864ba001a 100644
--- a/chromeos/ime/input_method_delegate.h
+++ b/chromeos/ime/input_method_delegate.h
@@ -19,9 +19,10 @@ class InputMethodDelegate {
   InputMethodDelegate() {}
   virtual ~InputMethodDelegate() {}
 
-  // Retrieves the hardware keyboard layout ID. May return an empty string if
-  // the ID is unknown.
-  virtual std::string GetHardwareKeyboardLayout() const = 0;
+  // Retrieves the hardware keyboard layout IDs. May return an empty list if
+  // the IDs are unknown.
+  virtual void GetHardwareKeyboardLayouts(
+      std::vector<std::string>* out) const = 0;
 
   // Retrieves localized string for |resource_id|.
   virtual base::string16 GetLocalizedString(int resource_id) const = 0;