Revert of Moving background animation ticking from LayerTreeHostImpl into the Scheduler.

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 2666c8c534a9a305300ba7017789a32b5ae8b34e..d1d196267ffc8c702da95a3fb6ec34401246d297 100644
--- a/cc/test/layer_tree_test.cc
+++ b/cc/test/layer_tree_test.cc
@@ -53,6 +53,10 @@
       raster_worker_pool, resource_pool, staging_resource_pool);
 }
 
+base::TimeDelta TestHooks::LowFrequencyAnimationInterval() const {
+  return base::TimeDelta::FromMilliseconds(16);
+}
+
 // Adapts ThreadProxy for test. Injects test hooks for testing.
 class ThreadProxyForTest : public ThreadProxy {
  public:
@@ -263,6 +267,10 @@
       }
     }
     test_hooks_->UpdateAnimationState(this, has_unfinished_animation);
+  }
+
+  base::TimeDelta LowFrequencyAnimationInterval() const override {
+    return test_hooks_->LowFrequencyAnimationInterval();
   }
 
  private:
@@ -667,7 +675,6 @@
   // Spend less time waiting for BeginFrame because the output is
   // mocked out.
   settings_.refresh_rate = 200.0;
-  settings_.background_animation_rate = 200.0;
   settings_.impl_side_painting = impl_side_painting;
   InitializeSettings(&settings_);