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 4854a1b5f99239498fd06323cd99ff7362c9a40f..224b2704600b772081b34539d272fb8a3098fc26 100644
--- a/ui/wm/core/input_method_event_filter.cc
+++ b/ui/wm/core/input_method_event_filter.cc
@@ -63,9 +63,11 @@ bool InputMethodEventFilter::DispatchKeyEventPostIME(
   DCHECK(!event.HasNativeEvent() || event.native_event().message != WM_CHAR);
 #endif
   ui::TranslatedKeyEvent aura_event(event);
-  ui::EventDispatchDetails details =
-      target_dispatcher_->OnEventFromSource(&aura_event);
-  CHECK(!details.dispatcher_destroyed);
+  if (target_dispatcher_) {

[Seigo Nonaka, 2014/05/26 04:59:29]

nit: I prefer early exit like:
if (!target_dispatcher_)
  return aura_event.handled();

[Shu Chen, 2014/05/26 05:04:49]

I don't think it's a good idea to have a dup code like this:

if (!target_dispatcher_)
  return aura_event.handled();
...
return aura_event.handled();

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