Read compositor VSync information from platform, when possible

chromeos/display/output_configurator_unittest.cc

Index: chromeos/display/output_configurator_unittest.cc
diff --git a/chromeos/display/output_configurator_unittest.cc b/chromeos/display/output_configurator_unittest.cc
index 7c74bd32b2422dfa87213eac44aa53e03172336d..05f9dc456aa244c648646935c8c5092410a76755 100644
--- a/chromeos/display/output_configurator_unittest.cc
+++ b/chromeos/display/output_configurator_unittest.cc
@@ -321,10 +321,10 @@ class TestStateController : public OutputConfigurator::StateController {
   // OutputConfigurator::StateController overrides:
   virtual OutputState GetStateForDisplayIds(
       const std::vector<int64>& outputs) const OVERRIDE { return state_; }
-  virtual bool GetResolutionForDisplayId(
-      int64 display_id,
-      int *width,
-      int *height) const OVERRIDE {
+  virtual bool GetResolutionForDisplayId(int64 display_id,
+                                         int* width,
+                                         int* height,
+                                         float* refresh_rate) const OVERRIDE {
     return false;
   }