Update from https://crrev.com/304418

base/debug/trace_event_impl.h

Index: base/debug/trace_event_impl.h
diff --git a/base/debug/trace_event_impl.h b/base/debug/trace_event_impl.h
index 6075e2dee78698a897ed2e5485d20a59de721edf..ce2e0178641e27a3ffce575dd1590b5f1c7b721e 100644
--- a/base/debug/trace_event_impl.h
+++ b/base/debug/trace_event_impl.h
@@ -420,6 +420,13 @@ struct BASE_EXPORT TraceOptions {
   bool enable_systrace;
 };
 
+struct BASE_EXPORT TraceLogStatus {
+  TraceLogStatus();
+  ~TraceLogStatus();
+  size_t event_capacity;
+  size_t event_count;
+};
+
 class BASE_EXPORT TraceLog {
  public:
   enum Mode {
@@ -495,7 +502,7 @@ class BASE_EXPORT TraceLog {
   void RemoveEnabledStateObserver(EnabledStateObserver* listener);
   bool HasEnabledStateObserver(EnabledStateObserver* listener) const;
 
-  float GetBufferPercentFull() const;
+  TraceLogStatus GetStatus() const;
   bool BufferIsFull() const;
 
   // Not using base::Callback because of its limited by 7 parameters.
@@ -603,7 +610,6 @@ class BASE_EXPORT TraceLog {
   static void DeleteForTesting();
 
   // Allow tests to inspect TraceEvents.
-  size_t GetEventsSize() const { return logged_events_->Size(); }
   TraceEvent* GetEventByHandle(TraceEventHandle handle);
 
   void SetProcessID(int process_id);