cc: Removing base::TimeTicks argument to DrawLayers as it isn't used.

cc/test/layer_tree_test.cc

Index: cc/test/layer_tree_test.cc
diff --git a/cc/test/layer_tree_test.cc b/cc/test/layer_tree_test.cc
index 93ddf120d4cdd968155e3d0f308d4d110c0c267a..055d0817d30466ff13be525e2b5edc9dedb5bd5a 100644
--- a/cc/test/layer_tree_test.cc
+++ b/cc/test/layer_tree_test.cc
@@ -275,8 +275,8 @@ class LayerTreeHostImplForTesting : public LayerTreeHostImpl {
     return test_hooks_->PrepareToDrawOnThread(this, frame, draw_result);
   }
 
-  void DrawLayers(FrameData* frame, base::TimeTicks frame_begin_time) override {
-    LayerTreeHostImpl::DrawLayers(frame, frame_begin_time);
+  void DrawLayers(FrameData* frame) override {
+    LayerTreeHostImpl::DrawLayers(frame);
     test_hooks_->DrawLayersOnThread(this);
   }