cc: Avoid deadlock with the UI thread and NPAPI in more cases

cc/scheduler/scheduler_settings.cc

Index: cc/scheduler/scheduler_settings.cc
diff --git a/cc/scheduler/scheduler_settings.cc b/cc/scheduler/scheduler_settings.cc
index c6c8e8eb2dbc00e2b6c37c6a0cd0d5ec0b2fd652..266ef1fedc9b4ec8b57baa5164b73ce973c21a7a 100644
--- a/cc/scheduler/scheduler_settings.cc
+++ b/cc/scheduler/scheduler_settings.cc
@@ -10,6 +10,7 @@ namespace cc {
 
 SchedulerSettings::SchedulerSettings()
     : use_external_begin_frame_source(false),
+      main_frame_while_swap_throttled_enabled(false),
       main_frame_before_activation_enabled(false),
       impl_side_painting(false),
       timeout_and_draw_when_animation_checkerboards(true),
@@ -28,6 +29,8 @@ SchedulerSettings::AsValue() const {
       new base::trace_event::TracedValue();
   state->SetBoolean("use_external_begin_frame_source",
                     use_external_begin_frame_source);
+  state->SetBoolean("main_frame_while_swap_throttled_enabled",
+                    main_frame_while_swap_throttled_enabled);
   state->SetBoolean("main_frame_before_activation_enabled",
                     main_frame_before_activation_enabled);
   state->SetBoolean("impl_side_painting", impl_side_painting);