Enable CursorManager::LockCursor to lock cursor visibility.

ui/aura/shared/compound_event_filter_unittest.cc

Index: ui/aura/shared/compound_event_filter_unittest.cc
diff --git a/ui/aura/shared/compound_event_filter_unittest.cc b/ui/aura/shared/compound_event_filter_unittest.cc
index 4b56fc4fa936982d397feeed84b0b01cffd5b088..b23b57c13ea7252af44dbc50352cbb7ce2ccfe8e 100644
--- a/ui/aura/shared/compound_event_filter_unittest.cc
+++ b/ui/aura/shared/compound_event_filter_unittest.cc
@@ -40,6 +40,12 @@ class TestVisibleClient : public aura::client::CursorClient {
   virtual void SetDeviceScaleFactor(float scale_factor) OVERRIDE {
   }
 
+  virtual void LockCursor() OVERRIDE {
+  }
+
+  virtual void UnlockCursor() OVERRIDE {
+  }
+
  private:
   bool visible_;
 };