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 a9e5a559a68a02739e4a0aea73abb2d1255eccb2..029cea31d42e7c6c3404a1e9ed9415f5e98d871b 100644
--- a/cc/trees/layer_tree_host_impl_unittest.cc
+++ b/cc/trees/layer_tree_host_impl_unittest.cc
@@ -130,7 +130,7 @@ class LayerTreeHostImplTest : public testing::Test,
     LayerTreeSettings settings;
     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;
   }