Introduce DisplayConfigurationController

ash/display/display_manager.cc

Index: ash/display/display_manager.cc
diff --git a/ash/display/display_manager.cc b/ash/display/display_manager.cc
index 5d47aba7a1534431d437fe40ee3fdbf921fc3f84..b5f65bee352d488ebeddd0d9403239b657867439 100644
--- a/ash/display/display_manager.cc
+++ b/ash/display/display_manager.cc
@@ -43,7 +43,6 @@
 #endif
 
 #if defined(OS_CHROMEOS)
-#include "ash/display/display_animator.h"
 #include "base/sys_info.h"
 #endif
 
@@ -934,10 +933,10 @@ int64_t DisplayManager::GetDisplayIdForUIScaling() const {
 }
 
 void DisplayManager::SetMirrorMode(bool mirror) {
-#if defined(OS_CHROMEOS)

[oshima, 2016/01/19 18:49:16]

did you have a problem with this on other platforms?

[stevenjb, 2016/01/19 20:32:04]

No, I just wanted to limit the #if defined(OS_CHROMES) to the actual chromeos
specific code. (I don't think this actually gets called on other platforms so we
could probably #ifdef out the entire method, but that would be extra work).

[oshima, 2016/01/19 20:59:30]

We're removing win_ash now, so you don't have to worry about it unless it has a
problem (crbug.com/558054). I'll leave it to you though.

   if (num_connected_displays() <= 1)
     return;
 
+#if defined(OS_CHROMEOS)
   if (base::SysInfo::IsRunningOnChromeOS()) {
     ui::MultipleDisplayState new_state =
         mirror ? ui::MULTIPLE_DISPLAY_STATE_DUAL_MIRROR
@@ -945,14 +944,10 @@ void DisplayManager::SetMirrorMode(bool mirror) {
     Shell::GetInstance()->display_configurator()->SetDisplayMode(new_state);
     return;
   }
+#endif
   multi_display_mode_ =
       mirror ? MIRRORING : current_default_multi_display_mode_;
   ReconfigureDisplays();
-  if (Shell::GetInstance()->display_animator()) {
-    Shell::GetInstance()->display_animator()->StartFadeInAnimation();
-  }
-  RunPendingTasksForTest();
-#endif
 }
 
 void DisplayManager::AddRemoveDisplay() {
@@ -1010,6 +1005,7 @@ void DisplayManager::SetDefaultMultiDisplayModeForCurrentDisplays(
   DisplayIdPair pair = GetCurrentDisplayIdPair();
   layout_store_->UpdateMultiDisplayState(pair, IsInMirrorMode(),
                                          mode == UNIFIED);
+  ReconfigureDisplays();
 }
 
 void DisplayManager::SetMultiDisplayMode(MultiDisplayMode mode) {