Fix queuing of display power state change requests

ui/display/chromeos/display_configurator.cc

Index: ui/display/chromeos/display_configurator.cc
diff --git a/ui/display/chromeos/display_configurator.cc b/ui/display/chromeos/display_configurator.cc
index eb1c0a4a8c4fe385b3dca2a83ed0493d7287216b..bd125439f4959a106d639c07e3ee39c19995c265 100644
--- a/ui/display/chromeos/display_configurator.cc
+++ b/ui/display/chromeos/display_configurator.cc
@@ -844,7 +844,13 @@ void DisplayConfigurator::SetDisplayPowerInternal(
     chromeos::DisplayPowerState power_state,
     int flags,
     const ConfigurationCallback& callback) {
+  // Only skip if the current power state is the same and the latest requested
+  // power state is the same. If |pending_power_state_ != current_power_state_|
+  // then there is a current taks pending or the last configuration failed. In

[oshima, 2016/07/15 21:56:50]

s/taks/task/

[dnicoara, 2016/07/18 13:49:29]

Woops, ... done.

+  // either case request a new configuration to make sure the state is
+  // consistent with the expectations.
   if (power_state == current_power_state_ &&
+      power_state == pending_power_state_ &&
       !(flags & kSetDisplayPowerForceProbe)) {
     callback.Run(true);
     return;