Revert of cc: Make heavy layer tree test more realistic

cc/trees/layer_tree_host_perftest.cc

Index: cc/trees/layer_tree_host_perftest.cc
diff --git a/cc/trees/layer_tree_host_perftest.cc b/cc/trees/layer_tree_host_perftest.cc
index 5a938af9c3181182658467e60a8eb47332376406..70b2a645236b977abcdce3f542c90ebf4015d9ca 100644
--- a/cc/trees/layer_tree_host_perftest.cc
+++ b/cc/trees/layer_tree_host_perftest.cc
@@ -38,7 +38,6 @@
                     base::TimeDelta::FromMilliseconds(kTimeLimitMillis),
                     kTimeCheckInterval),
         commit_timer_(0, base::TimeDelta(), 1),
-        animation_frame_(0),
         full_damage_each_frame_(false),
         animation_driven_drawing_(false),
         measure_commit_cost_(false) {
@@ -57,9 +56,7 @@
   virtual void Animate(base::TimeTicks monotonic_time) OVERRIDE {
     if (animation_driven_drawing_ && !TestEnded()) {
       layer_tree_host()->SetNeedsAnimate();
-      // Simulate a transform animation on the root layer.
-      Layer* layer = layer_tree_host()->root_layer();
-      layer->SetPosition(gfx::PointF(0, animation_frame_++ % 2));
+      layer_tree_host()->SetNextCommitForcesRedraw();
     }
   }
 
@@ -107,7 +104,6 @@
  protected:
   LapTimer draw_timer_;
   LapTimer commit_timer_;
-  int animation_frame_;
 
   std::string test_name_;
   FakeContentLayerClient fake_content_layer_client_;