Instrument SourceStream using MemoryDumpProvider

net/filter/source_stream.h

Index: net/filter/source_stream.h
diff --git a/net/filter/source_stream.h b/net/filter/source_stream.h
index be30c141a432eb6dd0a8a9e0304b28f8af531f79..6ad42da6f0af73515275e19732b4c8ff0bcfab52 100644
--- a/net/filter/source_stream.h
+++ b/net/filter/source_stream.h
@@ -14,6 +14,12 @@
 #include "net/base/net_errors.h"
 #include "net/base/net_export.h"
 
+namespace base {
+namespace trace_event {
+class ProcessMemoryDump;
+}
+}
+
 namespace net {
 
 class IOBuffer;
@@ -54,6 +60,13 @@ class NET_EXPORT_PRIVATE SourceStream {
   // logging.
   virtual std::string Description() const = 0;
 
+  // Dumps memory allocation stats. |parent_dump_absolute_name| is the name
+  // used by the parent MemoryAllocatorDump in the memory dump hierarchy.
+  // Default implementation does nothing.
+  virtual void DumpMemoryStats(
+      base::trace_event::ProcessMemoryDump* dump,
+      const std::string& parent_dump_absolute_name) const {}
+
   SourceType type() const { return type_; }
 
  private: