cc: Make animations tick regardless of drawing.

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 51a1a6131a41461ec15e9558ea7639c255bee6ac..67c0f07c53a87b4acc0c990017c9af5ed66f237c 100644
--- a/cc/test/layer_tree_test.cc
+++ b/cc/test/layer_tree_test.cc
@@ -462,7 +462,11 @@ void LayerTreeTest::DispatchAddAnimation(Layer* layer_to_receive_animation) {
   DCHECK(!proxy() || proxy()->IsMainThread());
 
   if (layer_to_receive_animation)
-    AddOpacityTransitionToLayer(layer_to_receive_animation, 10, 0, 0.5, true);
+    AddOpacityTransitionToLayer(layer_to_receive_animation,
+                                0.000001,
+                                0,
+                                0.5,
+                                true);
 }
 
 void LayerTreeTest::DispatchSetNeedsCommit() {
@@ -514,7 +518,9 @@ void LayerTreeTest::DispatchComposite() {
   }
 
   schedule_when_set_visible_true_ = false;
-  layer_tree_host_->Composite(base::TimeTicks::Now());
+  base::TimeTicks now = base::TimeTicks::Now();
+  layer_tree_host_->UpdateAnimations(now);
+  layer_tree_host_->Composite(now);
 }
 
 void LayerTreeTest::RunTest(bool threaded) {