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

content/browser/devtools/protocol/tracing_handler.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/devtools/protocol/tracing_handler.h"
 
 #include <cmath>
 
 #include "base/bind.h"
 #include "base/debug/trace_event_impl.h"
@@ skipping 124 matching lines @@
                  weak_factory_.GetWeakPtr(),
                  command));
   return command->AsyncResponsePromise();
 }
 
 void TracingHandler::OnRecordingEnabled(
     scoped_refptr<DevToolsProtocol::Command> command) {
   client_->SendStartResponse(command, StartResponse::Create());
 }
 
-void TracingHandler::OnBufferUsage(float usage) {
-  client_->BufferUsage(BufferUsageParams::Create()->set_value(usage));
+void TracingHandler::OnBufferUsage(float percent_full,
+                                   size_t approximate_event_count) {
+  client_->BufferUsage(BufferUsageParams::Create()->set_value(percent_full));
 }
 
 void TracingHandler::OnCategoriesReceived(
     scoped_refptr<DevToolsProtocol::Command> command,
     const std::set<std::string>& category_set) {
   std::vector<std::string> categories;
   for (const std::string& category : category_set)
     categories.push_back(category);
   client_->SendGetCategoriesResponse(command,
       GetCategoriesResponse::Create()->set_categories(categories));
@@ skipping 46 matching lines @@
 void TracingHandler::DisableRecording(bool abort) {
   is_recording_ = false;
   buffer_usage_poll_timer_.reset();
   TracingController::GetInstance()->DisableRecording(
       abort ? nullptr : new DevToolsTraceSinkProxy(weak_factory_.GetWeakPtr()));
 }
 
 }  // namespace tracing
 }  // namespace devtools
 }  // namespace content