Add Fade-out/Fade-in animation during output-configuration change.

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 9806edf3758e74450a04e60806a1c47a2cd6842a..d3f23114e496d6c989bf7c6a4b91bf569b267069 100644
--- a/chromeos/display/output_configurator.cc
+++ b/chromeos/display/output_configurator.cc
@@ -16,6 +16,7 @@
 #undef Status
 #undef RootWindow
 
+#include "base/bind.h"
 #include "base/chromeos/chromeos_version.h"
 #include "base/logging.h"
 #include "base/message_pump_aurax11.h"
@@ -399,6 +400,11 @@ bool OutputConfigurator::SetDisplayMode(OutputState new_state) {
                               new_state);
   XRRFreeScreenResources(screen);
   XUngrabServer(display);
+
+  MessageLoop::current()->PostTask(
+      FROM_HERE, base::Bind(&OutputConfigurator::NotifyOnDisplayChanged,
+                            base::Unretained(this)));
+
   return true;
 }
 
@@ -424,6 +430,14 @@ bool OutputConfigurator::Dispatch(const base::NativeEvent& event) {
   return true;
 }
 
+void OutputConfigurator::AddObserver(Observer* observer) {
+  observers_.AddObserver(observer);
+}
+
+void OutputConfigurator::RemoveObserver(Observer* observer) {
+  observers_.RemoveObserver(observer);
+}
+
 bool OutputConfigurator::TryRecacheOutputs(Display* display,
                                            XRRScreenResources* screen) {
   bool outputs_did_change = false;
@@ -843,4 +857,8 @@ void OutputConfigurator::CheckIsProjectingAndNotify() {
       dbus::ObjectProxy::EmptyResponseCallback());
 }
 
+void OutputConfigurator::NotifyOnDisplayChanged() {
+  FOR_EACH_OBSERVER(Observer, observers_, OnDisplayModeChanged());
+}
+
 }  // namespace chromeos