Report trace buffer usage as number of events, not only percentage

base/debug/trace_event_impl.cc

Index: base/debug/trace_event_impl.cc
diff --git a/base/debug/trace_event_impl.cc b/base/debug/trace_event_impl.cc
index ce62766da3df551884d487c2ea5f914a22f9d18a..45a4fea5f4ff833633d240446d8ac619676d88f8 100644
--- a/base/debug/trace_event_impl.cc
+++ b/base/debug/trace_event_impl.cc
@@ -1586,10 +1586,12 @@ bool TraceLog::HasEnabledStateObserver(EnabledStateObserver* listener) const {
   return it != enabled_state_observer_list_.end();
 }
 
-float TraceLog::GetBufferPercentFull() const {
+TraceLog::BufferUsage TraceLog::GetBufferUsage() const {
   AutoLock lock(lock_);
-  return static_cast<float>(static_cast<double>(logged_events_->Size()) /
-                            logged_events_->Capacity());
+  BufferUsage result;
+  result.event_capacity = logged_events_->Capacity();
+  result.event_count = logged_events_->Size();
+  return result;
 }
 
 bool TraceLog::BufferIsFull() const {