Add GetInputMethodDescriptorFromXkbId function.

chrome/browser/chromeos/input_method/input_method_util.h

Index: chrome/browser/chromeos/input_method/input_method_util.h
diff --git a/chrome/browser/chromeos/input_method/input_method_util.h b/chrome/browser/chromeos/input_method/input_method_util.h
index 0dd7897a789aad8b1828f886196bb67937234de6..b542f21f9326eaac83c2296b2080bb36a9ea2839 100644
--- a/chrome/browser/chromeos/input_method/input_method_util.h
+++ b/chrome/browser/chromeos/input_method/input_method_util.h
@@ -94,6 +94,13 @@ std::string GetInputMethodDisplayNameFromId(const std::string& input_method_id);
 const InputMethodDescriptor* GetInputMethodDescriptorFromId(
     const std::string& input_method_id);
 
+// Converts an XKB layout ID to an input method descriptor. Returns NULL when
+// |xkb_id| is unknown.
+// Example: "us(dvorak)" => { id: "xkb:us:dvorak:eng", display_name: "US Dv..",
+//                        keyboard_layout: "us(dvorak)", language_code: "eng" }
+const InputMethodDescriptor* GetInputMethodDescriptorFromXkbId(
+    const std::string& xkb_id);
+
 // Converts a language code to a language display name, using the
 // current application locale. MaybeRewriteLanguageName() is called
 // internally.