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

content/browser/browser_shutdown_profile_dumper.cc

Index: content/browser/browser_shutdown_profile_dumper.cc
diff --git a/content/browser/browser_shutdown_profile_dumper.cc b/content/browser/browser_shutdown_profile_dumper.cc
index c2533a09604cbe7a5490d55758acc4844e4a3f99..6dbc60aa8ea81b0cc3d9d2d181c48f6ee8ae81bf 100644
--- a/content/browser/browser_shutdown_profile_dumper.cc
+++ b/content/browser/browser_shutdown_profile_dumper.cc
@@ -18,6 +18,13 @@
 
 namespace content {
 
+static size_t GetTraceBufferPercentFull() {
+  float unused;
+  size_t num_events;
+  base::debug::TraceLog::GetInstance()->GetBufferUsage(&unused, &num_events);
+  return num_events;
+}
+
 BrowserShutdownProfileDumper::BrowserShutdownProfileDumper(
     const base::FilePath& dump_file_name)
     : dump_file_name_(dump_file_name),
@@ -34,9 +41,8 @@ void BrowserShutdownProfileDumper::WriteTracesToDisc() {
   // Since the tracer stops when the trace buffer is filled, we'd rather save
   // what we have than nothing since we might see from the amount of events
   // that caused the problem.
-  DVLOG(1) << "Flushing shutdown traces to disc. The buffer is %" <<
-      base::debug::TraceLog::GetInstance()->GetBufferPercentFull() <<
-      " full.";
+  DVLOG(1) << "Flushing shutdown traces to disc. The buffer is %"
+           << GetTraceBufferPercentFull() << " full.";
   DCHECK(!dump_file_);
   dump_file_ = base::OpenFile(dump_file_name_, "w+");
   if (!IsFileValid()) {