Revert of Disable RunMultiThread_DirectRenderer on Windows

cc/trees/layer_tree_host_unittest_animation.cc

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/trees/layer_tree_host.h"
 
 #include "cc/animation/animation_curve.h"
 #include "cc/animation/layer_animation_controller.h"
 #include "cc/animation/scroll_offset_animation_curve.h"
 #include "cc/animation/timing_function.h"
@@ skipping 913 matching lines @@
     controller_impl->AbortAnimations(Animation::TRANSFORM);
     EndTest();
   }
 
   void AfterTest() override {}
 
   FakeContentLayerClient client_;
   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.
 class LayerTreeHostAnimationTestAnimatedLayerRemovedAndAdded
     : public LayerTreeHostAnimationTest {
  public:
   void SetupTree() override {
     LayerTreeHostAnimationTest::SetupTree();
     layer_ = Layer::Create(layer_settings());
     layer_->SetBounds(gfx::Size(4, 4));
@@ skipping 356 matching lines @@
   bool called_animation_finished_;
   FakeContentLayerClient client_;
   scoped_refptr<FakePictureLayer> picture_;
 };
 
 SINGLE_AND_MULTI_THREAD_TEST_F(
     LayerTreeHostAnimationTestNotifyAnimationFinished);
 
 }  // namespace
 }  // namespace cc