cc: Simplify the logic for deciding to update tile priorities.

cc/layers/layer_position_constraint_unittest.cc

Index: cc/layers/layer_position_constraint_unittest.cc
diff --git a/cc/layers/layer_position_constraint_unittest.cc b/cc/layers/layer_position_constraint_unittest.cc
index 409c63492ca4d9a7ffc5d0deb6196f720530763b..4d8c5702857cbbf30f4f48f97d288dca5f5c00d4 100644
--- a/cc/layers/layer_position_constraint_unittest.cc
+++ b/cc/layers/layer_position_constraint_unittest.cc
@@ -4,6 +4,8 @@
 
 #include "cc/layers/layer_position_constraint.h"
 
+#include <vector>
+
 #include "cc/layers/layer_impl.h"
 #include "cc/test/fake_impl_proxy.h"
 #include "cc/test/fake_layer_tree_host_impl.h"
@@ -44,14 +46,14 @@ void ExecuteCalculateDrawProperties(LayerImpl* root_layer,
   // We are probably not testing what is intended if the root_layer bounds are
   // empty.
   DCHECK(!root_layer->bounds().IsEmpty());
-  LayerTreeHostCommon::CalculateDrawProperties(root_layer,
-                                               device_viewport_size,
-                                               device_scale_factor,
-                                               page_scale_factor,
-                                               dummy_max_texture_size,
-                                               can_use_lcd_text,
-                                               &dummy_render_surface_layer_list,
-                                               false);
+  LayerTreeHostCommon::CalculateDrawProperties(
+      root_layer,
+      device_viewport_size,
+      device_scale_factor,
+      page_scale_factor,
+      dummy_max_texture_size,
+      can_use_lcd_text,
+      &dummy_render_surface_layer_list);
 }
 
 void ExecuteCalculateDrawProperties(LayerImpl* root_layer) {
@@ -118,6 +120,7 @@ class LayerPositionConstraintTest : public testing::Test {
 
     return root.Pass();
   }
+
  protected:
   FakeImplProxy proxy_;
   FakeLayerTreeHostImpl host_impl_;