Provides more types of errors for output status.

chromeos/display/output_configurator.cc

Index: chromeos/display/output_configurator.cc
diff --git a/chromeos/display/output_configurator.cc b/chromeos/display/output_configurator.cc
index d2a5769aabf8a5af7a5103a8ca5fc27c3e9ab8dc..379bfbe28f182d8c6d5b20612215bd9f9101655c 100644
--- a/chromeos/display/output_configurator.cc
+++ b/chromeos/display/output_configurator.cc
@@ -649,7 +649,8 @@ bool OutputConfigurator::CycleDisplayMode() {
   if (did_change)
     NotifyOnDisplayChanged();
   else
-    FOR_EACH_OBSERVER(Observer, observers_, OnDisplayModeChangeFailed());
+    FOR_EACH_OBSERVER(
+        Observer, observers_, OnDisplayModeChangeFailed(next_state));
   return did_change;
 }
 
@@ -754,7 +755,8 @@ bool OutputConfigurator::SetDisplayMode(OutputState new_state) {
   if (output_state_ == new_state)
     NotifyOnDisplayChanged();
   else
-    FOR_EACH_OBSERVER(Observer, observers_, OnDisplayModeChangeFailed());
+    FOR_EACH_OBSERVER(
+        Observer, observers_, OnDisplayModeChangeFailed(new_state));
   return true;
 }
 
@@ -816,6 +818,9 @@ void OutputConfigurator::ConfigureOutputs() {
     changed = EnterState(display, screen, window, new_state, outputs);
     if (changed)
       output_state_ = new_state;
+    else
+      FOR_EACH_OBSERVER(
+          Observer, observers_, OnDisplayModeChangeFailed(new_state));

[oshima, 2013/02/14 00:01:50]

I think we need to move this out from xgrab section,
but let me fix the above issue first.

[Jun Mukai, 2013/02/14 00:54:03]

I have little ideas what you're talking. Can I leave this as is for now?

   }
   bool is_projecting = IsProjecting(outputs);
   XRRFreeScreenResources(screen);