Revert "Revert "Use libcros to convert input method ID to keyboard overlay ID.""

chrome/browser/chromeos/cros/input_method_library.h

Index: chrome/browser/chromeos/cros/input_method_library.h
diff --git a/chrome/browser/chromeos/cros/input_method_library.h b/chrome/browser/chromeos/cros/input_method_library.h
index 0c62ead74d192e31c949718726220dbc1260f0c8..26df7a779a28b2c4ec85271591faf361c797efc8 100644
--- a/chrome/browser/chromeos/cros/input_method_library.h
+++ b/chrome/browser/chromeos/cros/input_method_library.h
@@ -101,6 +101,11 @@ class InputMethodLibrary {
                             const std::string& config_name,
                             const ImeConfigValue& value) = 0;
 
+  // Returns the keyboard overlay ID corresponding to |input_method_id|.
+  // Returns an empty string if there is no corresponding keyboard overlay ID.
+  virtual std::string GetKeyboardOverlayId(
+      const std::string& input_method_id) = 0;
+
   // Sets the IME state to enabled, and launches its processes if needed.
   virtual void StartInputMethodProcesses() = 0;