Add buffer_to_texture_target_map to LayerTreeSettings

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 de683f838311e4290aae25404994f1ac047e2633..eae17830ad6c51fd13547d67dce3e3e5dac780ba 100644
--- a/cc/trees/layer_tree_host_impl_unittest.cc
+++ b/cc/trees/layer_tree_host_impl_unittest.cc
@@ -131,7 +131,7 @@ class LayerTreeHostImplTest : public testing::Test,
     settings.enable_surface_synchronization = true;
     settings.minimum_occlusion_tracking_size = gfx::Size();
     settings.renderer_settings.texture_id_allocation_chunk_size = 1;
-    settings.renderer_settings.buffer_to_texture_target_map =
+    settings.buffer_to_texture_target_map =
         DefaultBufferToTextureTargetMapForTesting();
     return settings;
   }