CC Animations: Make LayerAnimationController creation optional

cc/trees/layer_tree_host_pixeltest_synchronous.cc

Index: cc/trees/layer_tree_host_pixeltest_synchronous.cc
diff --git a/cc/trees/layer_tree_host_pixeltest_synchronous.cc b/cc/trees/layer_tree_host_pixeltest_synchronous.cc
index 7dd6d7d856df8a162314cc17b10307dc3d34f108..afbee15bfcff70a937a4b1577908438618c0e0fb 100644
--- a/cc/trees/layer_tree_host_pixeltest_synchronous.cc
+++ b/cc/trees/layer_tree_host_pixeltest_synchronous.cc
@@ -36,7 +36,8 @@ TEST_F(LayerTreeHostSynchronousPixelTest, OneContentLayer) {
   SkPaint green_paint;
   green_paint.setColor(SkColorSetARGB(255, 0, 255, 0));
   client.add_draw_rect(gfx::RectF(bounds), green_paint);
-  scoped_refptr<PictureLayer> root = PictureLayer::Create(&client);
+  scoped_refptr<PictureLayer> root =
+      PictureLayer::Create(layer_settings(), &client);
   root->SetBounds(bounds);
   root->SetIsDrawable(true);
 
@@ -66,7 +67,8 @@ TEST_F(LayerTreeHostSynchronousGPUPixelTest, OneContentLayer) {
   SkPaint green_paint;
   green_paint.setColor(SkColorSetARGB(255, 0, 255, 0));
   client.add_draw_rect(gfx::RectF(bounds), green_paint);
-  scoped_refptr<PictureLayer> root = PictureLayer::Create(&client);
+  scoped_refptr<PictureLayer> root =
+      PictureLayer::Create(layer_settings(), &client);
   root->SetBounds(bounds);
   root->SetIsDrawable(true);