Revert 250798 "Revert of Read compositor VSync information from ..."

trunk/src/ash/display/display_controller.cc

Index: trunk/src/ash/display/display_controller.cc
===================================================================
--- trunk/src/ash/display/display_controller.cc	(revision 250808)
+++ trunk/src/ash/display/display_controller.cc	(working copy)
@@ -34,6 +34,7 @@
 #include "ui/aura/window_property.h"
 #include "ui/aura/window_tracker.h"
 #include "ui/compositor/compositor.h"
+#include "ui/compositor/compositor_vsync_manager.h"
 #include "ui/gfx/display.h"
 #include "ui/gfx/screen.h"
 
@@ -120,6 +121,14 @@
   scoped_ptr<aura::RootWindowTransformer> transformer(
       internal::CreateRootWindowTransformerForDisplay(root->window(), display));
   root->host()->SetRootWindowTransformer(transformer.Pass());
+
+  internal::DisplayMode mode;
+  if (GetDisplayManager()->GetSelectedModeForDisplayId(display.id(), &mode) &&
+      mode.refresh_rate > 0.0f) {
+    root->host()->compositor()->vsync_manager()->SetAuthoritativeVSyncInterval(
+        base::TimeDelta::FromMicroseconds(base::Time::kMicrosecondsPerSecond /
+                                          mode.refresh_rate));
+  }
 }
 
 }  // namespace