Supports fake key events for setComposition/commitText by on-screen keyboards.

ui/wm/core/input_method_event_filter.cc

Index: ui/wm/core/input_method_event_filter.cc
diff --git a/ui/wm/core/input_method_event_filter.cc b/ui/wm/core/input_method_event_filter.cc
index 65bd5b506460b61d7dbe6c43a43f13f15882fe3f..735f7b43a3766d1feffcccd69ce04829b57df3c6 100644
--- a/ui/wm/core/input_method_event_filter.cc
+++ b/ui/wm/core/input_method_event_filter.cc
@@ -88,9 +88,11 @@ bool InputMethodEventFilter::DispatchKeyEventPostIME(
   // dispatched event.
   ui::KeyEvent aura_event(event);
   aura_event.SetTranslated(true);
-  ui::EventDispatchDetails details =
-      target_dispatcher_->OnEventFromSource(&aura_event);
-  CHECK(!details.dispatcher_destroyed);
+  if (target_dispatcher_) {

[Yuki, 2014/05/28 06:04:19]

Do you really need this check?  In which cases will |target_dispatcher_| be
null?

[Shu Chen, 2014/05/28 06:59:50]

When DispatchKeyEventPostIME() method is called without any physical key events,
it will be NULL.

I've refactored this part a little bit. PTAL.

+    ui::EventDispatchDetails details =
+        target_dispatcher_->OnEventFromSource(&aura_event);
+    CHECK(!details.dispatcher_destroyed);
+  }
   return aura_event.handled();
 }