Instrument SourceStream using MemoryDumpProvider

net/filter/filter_source_stream.h

Index: net/filter/filter_source_stream.h
diff --git a/net/filter/filter_source_stream.h b/net/filter/filter_source_stream.h
index 3d24bd1a92116f0079702c16436a2ed334753ce0..9ea2b3f76c9d290e773992d04eac73ceec269bd3 100644
--- a/net/filter/filter_source_stream.h
+++ b/net/filter/filter_source_stream.h
@@ -15,6 +15,12 @@
 #include "net/base/net_export.h"
 #include "net/filter/source_stream.h"
 
+namespace base {
+namespace trace_event {
+class ProcessMemoryDump;
+}
+}
+
 namespace net {
 
 class DrainableIOBuffer;
@@ -38,6 +44,10 @@ class NET_EXPORT_PRIVATE FilterSourceStream : public SourceStream {
 
   std::string Description() const override;
 
+  void DumpMemoryStats(
+      base::trace_event::ProcessMemoryDump* dump,
+      const std::string& parent_dump_absolute_name) const override;
+
  private:
   enum State {
     STATE_NONE,
@@ -78,6 +88,13 @@ class NET_EXPORT_PRIVATE FilterSourceStream : public SourceStream {
                          int* consumed_bytes,
                          bool upstream_eof_reached) = 0;
 
+  // Subclasses can implement this method to dump memory allocation stats.
+  // Subclasses should override this method instead of DumpMemoryStats
+  // so the whole chain of FilterSourceStream can be accounted for.
+  virtual void DumpMemoryStatsImpl(
+      base::trace_event::ProcessMemoryDump* dump,
+      const std::string& parent_dump_absolute_name) const;
+
   // Returns a string representation of the type of this FilterSourceStream.
   // This is for UMA logging.
   virtual std::string GetTypeAsString() const = 0;