Add documentation in memory_benchmarks.md on finding links to trace files

net/url_request/url_request_context.h

 // Copyright (c) 2012 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.
 
 // This class represents contextual information (cookies, cache, etc.)
 // that's necessary when processing resource requests.
 
 #ifndef NET_URL_REQUEST_URL_REQUEST_CONTEXT_H_
 #define NET_URL_REQUEST_URL_REQUEST_CONTEXT_H_
 
@@ skipping 263 matching lines @@
 
   // Returns current value of the |check_cleartext_permitted| flag.
   bool check_cleartext_permitted() const { return check_cleartext_permitted_; }
 
   // Sets a name for this URLRequestContext. Currently the name is used in
   // MemoryDumpProvier to annotate memory usage. The name does not need to be
   // unique.
   void set_name(const char* name) { name_ = name; }
 
   // MemoryDumpProvider implementation:
+  // This is reported as
+  // "memory:chrome:all_processes:reported_by_chrome:net:effective_size_avg."
   bool OnMemoryDump(const base::trace_event::MemoryDumpArgs& args,
                     base::trace_event::ProcessMemoryDump* pmd) override;
 
   void AssertCalledOnValidThread() {
     DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
   }
 
  private:
   // ---------------------------------------------------------------------------
   // Important: When adding any new members below, consider whether they need to
@@ skipping 47 matching lines @@
   mutable size_t largest_outstanding_requests_count_seen_;
 
   THREAD_CHECKER(thread_checker_);
 
   DISALLOW_COPY_AND_ASSIGN(URLRequestContext);
 };
 
 }  // namespace net
 
 #endif  // NET_URL_REQUEST_URL_REQUEST_CONTEXT_H_