Slow Reports - Embed Metadata in Traces

content/public/browser/background_tracing_manager.h

Index: content/public/browser/background_tracing_manager.h
diff --git a/content/public/browser/background_tracing_manager.h b/content/public/browser/background_tracing_manager.h
index 75e2d340cd8d46bb96dda3ced749ee7ef25e0acb..8ad6cd874c9a2ab9b979c331c76e1ba7255cfc5f 100644
--- a/content/public/browser/background_tracing_manager.h
+++ b/content/public/browser/background_tracing_manager.h
@@ -5,6 +5,9 @@
 #ifndef CONTENT_PUBLIC_BROWSER_BACKGROUND_TRACING_MANAGER_H_
 #define CONTENT_PUBLIC_BROWSER_BACKGROUND_TRACING_MANAGER_H_
 
+#include <map>
+#include <string>
+
 #include "base/trace_event/trace_event_impl.h"
 #include "base/values.h"
 #include "content/common/content_export.h"
@@ -23,13 +26,15 @@ class BackgroundTracingManager {
 
   // ReceiveCallback will will be called on the UI thread every time the
   // BackgroundTracingManager finalizes a trace. The first parameter of
-  // this callback is the trace data. The second is a callback to
+  // this callback is the trace data. The second is metadata that was
+  // generated and embedded into the trace. The third is a callback to
   // notify the BackgroundTracingManager that you've finished processing
   // the trace data.
   //
   // Example:
   //
-  // void Upload(const base::RefCountedString* data,
+  // void Upload(const scoped_refptr<base::RefCountedString>& data,
+  //             const std::map<std::string, std::string>& metadata,
   //             base::Closure done_callback) {
   //   BrowserThread::PostTaskAndReply(
   //       BrowserThread::FILE,
@@ -40,6 +45,7 @@ class BackgroundTracingManager {
   // }
   //
   typedef base::Callback<void(const scoped_refptr<base::RefCountedString>&,
+                              const std::map<std::string, std::string>&,
                               base::Closure)> ReceiveCallback;
 
   // Set the triggering rules for when to start recording.