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..66a5b17601dbbe6e411cd19e90dd68635b581add 100644
--- a/chromeos/display/output_configurator.cc
+++ b/chromeos/display/output_configurator.cc
@@ -255,9 +255,11 @@ static int GetDualOutputs(Display* display,
       to_populate->mirror_mode = 0;
 
       // See if this output refers to an internal display.
+      // TODO(oshmia): Use |IsInternalOutputName| once the change is merged
+      // to m23. crbug.com/152003.
+      const std::string name(output_info->name);
       to_populate->is_internal =
-          OutputConfigurator::IsInternalOutputName(
-              std::string(output_info->name));
+          name.find(kInternal_LVDS) == 0 || name.find(kInternal_eDP) == 0;
 
       VLOG(1) << "Found display #" << found_count
               << " with output " << (int)to_populate->output
@@ -375,8 +377,13 @@ 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 +841,9 @@ 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;
 }
 
 void OutputConfigurator::NotifyOnDisplayChanged() {