Refactoring for the InputMethod & InputMethodDelegate interfaces.

ash/host/ash_window_tree_host_unified.cc

Index: ash/host/ash_window_tree_host_unified.cc
diff --git a/ash/host/ash_window_tree_host_unified.cc b/ash/host/ash_window_tree_host_unified.cc
index 7e78691629dee29c94c9ff5c4af288bb2771f48c..2759af6d1332e6fbc73cfe989cd27011b2c7c3ff 100644
--- a/ash/host/ash_window_tree_host_unified.cc
+++ b/ash/host/ash_window_tree_host_unified.cc
@@ -177,16 +177,14 @@ void AshWindowTreeHostUnified::OnWindowDestroying(aura::Window* window) {
   mirroring_hosts_.erase(iter);
 }
 
-bool AshWindowTreeHostUnified::DispatchKeyEventPostIME(
-    const ui::KeyEvent& event) {
-  ui::KeyEvent event_copy(event);
+ui::EventDispatchDetails AshWindowTreeHostUnified::DispatchKeyEventPostIME(
+    ui::KeyEvent* event) {
   input_method_handler()->SetPostIME(true);
   ui::EventDispatchDetails details =
-      event_processor()->OnEventFromSource(&event_copy);
-  if (details.dispatcher_destroyed)
-    return true;
-  input_method_handler()->SetPostIME(false);
-  return event_copy.stopped_propagation();
+      event_processor()->OnEventFromSource(event);
+  if (!details.dispatcher_destroyed)
+    input_method_handler()->SetPostIME(false);
+  return details;
 }
 
 }  // namespace ash