Apply Ash's key rewriter to an aura::MouseEvent so that Modifler+Click is handled correctly

ash/key_rewriter_delegate.h

Index: ash/key_rewriter_delegate.h
diff --git a/ash/key_rewriter_delegate.h b/ash/key_rewriter_delegate.h
index 16fcad9675b2a29bc6ab94e00d44938bb2dd836c..f34d4695577e529f7178ca6f07febd32e9183ab2 100644
--- a/ash/key_rewriter_delegate.h
+++ b/ash/key_rewriter_delegate.h
@@ -8,6 +8,7 @@
 
 namespace aura {
 class KeyEvent;
+class LocatedEvent;
 }  // namespace aura
 
 namespace ash {
@@ -26,6 +27,7 @@ class KeyRewriterDelegate {
   // 1) Just return ACTION_DROP_EVENT to drop the |event|.
   // 2) Rewrite the |event| and return ACTION_REWRITE_EVENT.
   virtual Action RewriteOrFilterKeyEvent(aura::KeyEvent* event) = 0;
+  virtual Action RewriteOrFilterLocatedEvent(aura::LocatedEvent* event) = 0;
 };
 
 }  // namespace ash