[scheduler] Bunch of improvements for blink scheduler tracing

third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.h

Index: third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.h
diff --git a/third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.h b/third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.h
index bc0c3d61673941d281a437980f1da94c676af044..1d06accd17f8c55ca3223a343d66ab9395dcf01a 100644
--- a/third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.h
+++ b/third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.h
@@ -201,6 +201,8 @@ class BLINK_PLATFORM_EXPORT RendererSchedulerImpl
     VIRTUAL,
   };
 
+  static const char* TimeDomainTypeToString(TimeDomainType domain_type);
+
   struct TaskQueuePolicy {
     TaskQueuePolicy()
         : is_enabled(true),
@@ -215,6 +217,8 @@ class BLINK_PLATFORM_EXPORT RendererSchedulerImpl
       return is_enabled == other.is_enabled && priority == other.priority &&
              time_domain_type == other.time_domain_type;
     }
+
+    void AsValueInto(base::trace_event::TracedValue* state) const;
   };
 
   struct Policy {
@@ -233,6 +237,8 @@ class BLINK_PLATFORM_EXPORT RendererSchedulerImpl
              rail_mode == other.rail_mode &&
              should_disable_throttling == other.should_disable_throttling;
     }
+
+    void AsValueInto(base::trace_event::TracedValue* state) const;
   };
 
   class PollableNeedsUpdateFlag {