cc : Compute visible rects dynamically (1)

cc/layers/scrollbar_layer_unittest.cc

Index: cc/layers/scrollbar_layer_unittest.cc
diff --git a/cc/layers/scrollbar_layer_unittest.cc b/cc/layers/scrollbar_layer_unittest.cc
index a62399b216c13a048230cc6a5437ece5979d9217..4237e5bec42d99921d3245b3283e9d9bd017d6f5 100644
--- a/cc/layers/scrollbar_layer_unittest.cc
+++ b/cc/layers/scrollbar_layer_unittest.cc
@@ -107,6 +107,7 @@ class ScrollbarLayerTest : public testing::Test {
     layer_tree_settings_.scrollbar_fade_duration_ms = 20;
     layer_tree_settings_.verify_transform_tree_calculations = true;
     layer_tree_settings_.verify_clip_tree_calculations = true;
+    layer_tree_settings_.verify_visible_rect_calculations = true;
 
     scrollbar_layer_id_ = -1;
 
@@ -644,6 +645,7 @@ class ScrollbarLayerSolidColorThumbTest : public testing::Test {
     LayerTreeSettings layer_tree_settings;
     layer_tree_settings.verify_transform_tree_calculations = true;
     layer_tree_settings.verify_clip_tree_calculations = true;
+    layer_tree_settings.verify_visible_rect_calculations = true;
     host_impl_.reset(new FakeLayerTreeHostImpl(
         layer_tree_settings, &task_runner_provider_, &shared_bitmap_manager_,
         &task_graph_runner_));