Add BytesRead metric to CPM

chrome/browser/net/chrome_network_delegate.cc

Index: chrome/browser/net/chrome_network_delegate.cc
diff --git a/chrome/browser/net/chrome_network_delegate.cc b/chrome/browser/net/chrome_network_delegate.cc
index c9f69cc5f68ba611223563a6609831582d0aff68..ca8434730b3d01a480f059656b918a5a51dd6c8d 100644
--- a/chrome/browser/net/chrome_network_delegate.cc
+++ b/chrome/browser/net/chrome_network_delegate.cc
@@ -15,6 +15,7 @@
 #include "chrome/browser/extensions/extension_info_map.h"
 #include "chrome/browser/extensions/extension_process_manager.h"
 #include "chrome/browser/net/cache_stats.h"
+#include "chrome/browser/performance_monitor/performance_monitor.h"
 #include "chrome/browser/prefs/pref_member.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/task_manager/task_manager.h"
@@ -233,6 +234,10 @@ void ChromeNetworkDelegate::OnResponseStarted(net::URLRequest* request) {
 
 void ChromeNetworkDelegate::OnRawBytesRead(const net::URLRequest& request,
                                            int bytes_read) {
+  if (performance_monitor::PerformanceMonitor::enabled()) {
+    performance_monitor::PerformanceMonitor::GetInstance()->BytesRead(
+        bytes_read);

[battre, 2012/08/21 16:16:04]

OnRawBytesRead is called on the IO thread. In
PerformanceMonitor::GatherStatisticsOnBackgroundThread(), bytes_read is accessed
on a background thread.

[Devlin, 2012/08/21 19:46:46]

See comment in performance_monitor.cc

+  }
 #if defined(ENABLE_TASK_MANAGER)
   TaskManager::GetInstance()->model()->NotifyBytesRead(request, bytes_read);
 #endif  // defined(ENABLE_TASK_MANAGER)