Update from https://crrev.com/304121

cc/trees/layer_tree_settings.cc

Index: cc/trees/layer_tree_settings.cc
diff --git a/cc/trees/layer_tree_settings.cc b/cc/trees/layer_tree_settings.cc
index 1d5cf1bb2ebbc5976f4ebfe7dfd7e2b25b85a8ec..48c41330978850797c851fa0ac277a524746eaa5 100644
--- a/cc/trees/layer_tree_settings.cc
+++ b/cc/trees/layer_tree_settings.cc
@@ -16,9 +16,11 @@ LayerTreeSettings::LayerTreeSettings()
     : impl_side_painting(false),
       allow_antialiasing(true),
       force_antialiasing(false),
+      force_blending_with_shaders(false),
       throttle_frame_production(true),
       single_thread_proxy_scheduler(true),
-      begin_frame_scheduling_enabled(false),
+      use_external_begin_frame_source(false),
+      forward_begin_frames_to_children(false),
       main_frame_before_activation_enabled(false),
       using_synchronous_renderer_compositor(false),
       disable_hi_res_timer_tasks_on_battery(false),
@@ -47,6 +49,7 @@ LayerTreeSettings::LayerTreeSettings()
       top_controls_show_threshold(0.5f),
       top_controls_hide_threshold(0.5f),
       refresh_rate(60.0),
+      background_animation_rate(1.0),
       max_partial_texture_updates(std::numeric_limits<size_t>::max()),
       default_tile_size(gfx::Size(256, 256)),
       max_untiled_layer_size(gfx::Size(512, 512)),