Add two functions for handwriting: SendHandwritingStrokes and CancelHandwriting.

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 e42cbbdc3d92054699e0e21061b4808b78389b59..3f44e6a0944b6aed3fe2c8adbde41b710f684bce 100644
--- a/chrome/browser/chromeos/cros/input_method_library.h
+++ b/chrome/browser/chromeos/cros/input_method_library.h
@@ -121,6 +121,13 @@ class InputMethodLibrary {
   // engines are removed.
   virtual void SetEnableAutoImeShutdown(bool enable) = 0;
 
+  // Sends a handwriting stroke to libcros. See chromeos::SendHandwritingStroke
+  // for details.
+  virtual void SendHandwritingStroke(const HandwritingStroke& stroke) = 0;
+
+  // Clears last N handwriting strokes in libcros. See
+  // chromeos::CancelHandwriting for details.
+  virtual void CancelHandwriting(int n_strokes) = 0;
 
   virtual const InputMethodDescriptor& previous_input_method() const = 0;
   virtual const InputMethodDescriptor& current_input_method() const = 0;