Use NetworkTrafficAnnotation in URLRequestContext UMA logging

net/url_request/url_request_context.cc

 // 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.
 
 #include "net/url_request/url_request_context.h"
 
 #include <inttypes.h>
 
 #include "base/compiler_specific.h"
 #include "base/debug/alias.h"
@@ skipping 109 matching lines @@
 void URLRequestContext::set_cookie_store(CookieStore* cookie_store) {
   cookie_store_ = cookie_store;
 }
 
 void URLRequestContext::InsertURLRequest(const URLRequest* request) const {
   url_requests_.insert(request);
   if (url_requests_.size() > largest_outstanding_requests_count_seen_) {
     largest_outstanding_requests_count_seen_ = url_requests_.size();
     UMA_HISTOGRAM_COUNTS_1M("Net.URLRequestContext.OutstandingRequests",
                             largest_outstanding_requests_count_seen_);
+    UMA_HISTOGRAM_SPARSE_SLOWLY(
+        "Net.URLRequestContext.OutstandingRequests.Type",
+        request->traffic_annotation().unique_id_hash_code);
   }
 }
 
 void URLRequestContext::RemoveURLRequest(const URLRequest* request) const {
   DCHECK_EQ(1u, url_requests_.count(request));
   url_requests_.erase(request);
 }
 
 void URLRequestContext::AssertNoURLRequests() const {
   int num_requests = url_requests_.size();
@@ skipping 36 matching lines @@
     HttpCache* http_cache = transaction_factory->GetCache();
     if (http_cache)
       http_cache->DumpMemoryStats(pmd, dump->absolute_name());
   }
   if (sdch_manager_)
     sdch_manager_->DumpMemoryStats(pmd, dump_name);
   return true;
 }
 
 }  // namespace net