Add unique identifier to url requests

BUG=60101
TEST=net_unittests

Review URL: http://codereview.chromium.org/6526014

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@75241 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 15 insertions, 1 deletions

diff --git a/net/url_request/url_request.cc b/net/url_request/url_request.cc
index c2d0f4f..9e35fc0 100644
--- a/net/url_request/url_request.cc
+++ b/net/url_request/url_request.cc
@@ -8,6 +8,7 @@
 #include "base/message_loop.h"
 #include "base/metrics/stats_counters.h"
 #include "base/singleton.h"
+#include "base/synchronization/lock.h"
 #include "net/base/load_flags.h"
 #include "net/base/net_errors.h"
 #include "net/base/net_log.h"
@@ -39,6 +40,18 @@ void StripPostSpecificHeaders(net::HttpRequestHeaders* headers) {
   headers->RemoveHeader(net::HttpRequestHeaders::kOrigin);
 }
 
+// This counter keeps track of the identifiers used for URL requests so far.
+uint64 g_next_url_request_identifier = 0;
+
+// This lock protects g_next_url_request_identifier.
+base::Lock g_next_url_request_identifier_lock;
+
+// Returns an prior unused identifier for URL requests.
+uint64 GenerateURLRequestIdentifier() {
+  base::AutoLock lock(g_next_url_request_identifier_lock);
+  return g_next_url_request_identifier++;
+}
+
 }  // namespace
 
 namespace net {
@@ -105,7 +118,8 @@ URLRequest::URLRequest(const GURL& url, Delegate* delegate)
       enable_profiling_(false),
       redirect_limit_(kMaxRedirects),
       final_upload_progress_(0),
-      priority_(net::LOWEST) {
+      priority_(net::LOWEST),
+      identifier_(GenerateURLRequestIdentifier()) {
   SIMPLE_STATS_COUNTER("URLRequestCount");
 
   // Sanity check out environment.