Migrate WaitableEvent to enum-based constructor in cc/

cc/trees/layer_tree_host_unittest.cc

Index: cc/trees/layer_tree_host_unittest.cc
diff --git a/cc/trees/layer_tree_host_unittest.cc b/cc/trees/layer_tree_host_unittest.cc
index 13f54ee97cf0600ea478ed1a99294956eed03631..764528d4f751ad31472e3ac1330bb3005e112ec2 100644
--- a/cc/trees/layer_tree_host_unittest.cc
+++ b/cc/trees/layer_tree_host_unittest.cc
@@ -5277,7 +5277,8 @@ MULTI_THREAD_TEST_F(LayerTreeHostAcceptsDeltasFromImplWithoutRootLayer);
 class LayerTreeHostTestCrispUpAfterPinchEnds : public LayerTreeHostTest {
  protected:
   LayerTreeHostTestCrispUpAfterPinchEnds()
-      : playback_allowed_event_(true, true) {}
+      : playback_allowed_event_(base::WaitableEvent::ResetPolicy::MANUAL,
+                                base::WaitableEvent::InitialState::SIGNALED) {}
 
   void SetupTree() override {
     frame_ = 1;
@@ -5579,7 +5580,8 @@ class LayerTreeHostTestContinuousDrawWhenCreatingVisibleTiles
     : public LayerTreeHostTest {
  protected:
   LayerTreeHostTestContinuousDrawWhenCreatingVisibleTiles()
-      : playback_allowed_event_(true, true) {}
+      : playback_allowed_event_(base::WaitableEvent::ResetPolicy::MANUAL,
+                                base::WaitableEvent::InitialState::SIGNALED) {}
 
   void SetupTree() override {
     step_ = 1;