cc:: Don't use cached screen space transform for layers not in RSLL.

cc/trees/layer_tree_host_impl_unittest.cc

Index: cc/trees/layer_tree_host_impl_unittest.cc
diff --git a/cc/trees/layer_tree_host_impl_unittest.cc b/cc/trees/layer_tree_host_impl_unittest.cc
index 431a54660fc5253712fed7b0ac37668f4b32fb8e..c06741ad66d59f1fa07a504e59d63d1b5d680397 100644
--- a/cc/trees/layer_tree_host_impl_unittest.cc
+++ b/cc/trees/layer_tree_host_impl_unittest.cc
@@ -100,6 +100,7 @@ class LayerTreeHostImplTest : public testing::Test,
     settings.renderer_settings.texture_id_allocation_chunk_size = 1;
     settings.gpu_rasterization_enabled = true;
     settings.verify_property_trees = true;
+    settings.use_property_trees = true;

[ajuma, 2015/11/19 01:52:04]

I'd prefer removing this and leaving the settings as-is, so that these tests
switch over to property trees at the same time as other tests.

     return settings;
   }
 
@@ -4741,7 +4742,6 @@ TEST_F(LayerTreeHostImplTest, ScrollPerspectiveTransformedLayer) {
 TEST_F(LayerTreeHostImplTest, ScrollScaledLayer) {
   LayerImpl* scroll_layer =
       SetupScrollAndContentsLayers(gfx::Size(100, 100));
-  scroll_layer->SetDrawsContent(true);

[jaydasika, 2015/11/19 01:10:11]

We already have a lot of unit test coverage for the changes in this patch. Any
test calling 'ScrollBy' hits the changes by this patch. But, the bug is not
exposed because use_property_trees = false and scroll layer draws content in
most of those tests. So, to test the changes in this patch, I have made use
property trees = true and made scroll layer not draw content in one of the
tests. This modified test fails without the patch.

 
   // Scale the layer to twice its normal size.
   int scale = 2;