Disable extended desktop.

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 6fb573a37b4646d9c84023d22922e4dad912e0cc..c55f25675341f8c27940f2318c7beac16b32276d 100644
--- a/chromeos/display/output_configurator.cc
+++ b/chromeos/display/output_configurator.cc
@@ -375,8 +375,13 @@ static OutputState GetNextState(Display* display,
           (0 != outputs[1].mirror_mode);
       switch (current_state) {
         case STATE_DUAL_PRIMARY_ONLY:
-          state =
-              mirror_supported ? STATE_DUAL_MIRROR : STATE_DUAL_PRIMARY_ONLY;
+          // TODO(oshima): Temporarily disable extended
+          // desktop. crbug.com/152003.
+          state = STATE_DUAL_SECONDARY_ONLY;
+          break;
+        case STATE_DUAL_SECONDARY_ONLY:
+          state = mirror_supported ?
+              STATE_DUAL_MIRROR : STATE_DUAL_PRIMARY_ONLY;
           break;
         case STATE_DUAL_MIRROR:
           state = STATE_DUAL_PRIMARY_ONLY;
@@ -834,7 +839,9 @@ void OutputConfigurator::RemoveObserver(Observer* observer) {
 
 // static
 bool OutputConfigurator::IsInternalOutputName(const std::string& name) {
-  return name.find(kInternal_LVDS) == 0 || name.find(kInternal_eDP) == 0;
+  // TODO(oshima): There is only one display for m23 and no need to
+  // distinguish internal display.
+  return false;

[Josh Horwich, 2012/09/25 00:06:52]

Will the fact that we will now always have IsProjecting return false (and
forwarded via SetIsProjecting) be a problem? I'm not familiar with the purpose
of knowing if we're projecting or not, or if saying "not projecting" is
appropriate for all three STATE_DUAL_ modes

 }
 
 void OutputConfigurator::NotifyOnDisplayChanged() {