Revert of Disable RunMultiThread_DirectRenderer on Windows

cc/trees/layer_tree_host_unittest_animation.cc

Index: cc/trees/layer_tree_host_unittest_animation.cc
diff --git a/cc/trees/layer_tree_host_unittest_animation.cc b/cc/trees/layer_tree_host_unittest_animation.cc
index b10e0922f9093d9e208d7297e04d09a6975472cd..b41005a464932f10456c74a3270c2e15285d568b 100644
--- a/cc/trees/layer_tree_host_unittest_animation.cc
+++ b/cc/trees/layer_tree_host_unittest_animation.cc
@@ -931,9 +931,8 @@
   scoped_refptr<Layer> layer_;
 };
 
-// Flaky: http://crbug.com/527087
-// SINGLE_AND_MULTI_THREAD_TEST_F(
-//    LayerTreeHostAnimationTestPendingTreeAnimatesFirstCommit);
+SINGLE_AND_MULTI_THREAD_TEST_F(
+    LayerTreeHostAnimationTestPendingTreeAnimatesFirstCommit);
 
 // When a layer with an animation is removed from the tree and later re-added,
 // the animation should resume.